API Remove Object class

API DataObjectSchema::manyManyComponent() return array is now associative array

docs/en/04_Changelogs/4.0.0.md

@@ -30,6 +30,7 @@ guide developers in preparing existing 3.x code for compatibility with 4.0
   arrangement of templates, as well as other references to classes via string literals or configuration.
   Automatic upgrading tools have been developed to cope with the bulk of these changes (see
   [upgrading notes](#upgrading)).
+* Object class has been removed.
 * Asset storage has been abstracted, and a new concept of `DBFile` references via database column references
   now exists in addition to references via the existing `File` dataobject. File security and protected files
   are now a core feature.
@@ -161,6 +162,90 @@ Note also that `$_FILE_TO_URL_MAPPING` has been removed and replaced with `SS_BA
 
 See [Environment Management docs](/getting-started/environment_management/) for full details.
 
+#### Replace usages of Object class
+
+Object has been superseded by a trio of traits which replace components of this legacy class:
+
+ - Injectable: Provides `MyClass::create()` and `MyClass::singleton()`
+ - Configurable: Provides `MyClass::config()`
+ - Extensible: Provides all methods related to extensions (E.g. add_extension()). Note:
+   All classes which use this trait MUST invoke `constructExtensions()` in its constructor.
+ 
+In particular specific Object class usages should be replaced as below:
+
+
+Upgrade subclasses
+
+
+    :::php
+    // old
+    class MyClass extends Object {}
+    // new
+    class MyClass {
+        use Extensible;
+        use Injectable;
+        use Configurable;
+        
+        public function __construct() {
+            // Only needed if using Extensible trait
+            $this->constructExtensions();
+        }
+    }
+
+
+References to $this->class
+
+
+    :::php
+    // old
+    $obj->class
+    $this->class;
+    // new
+    get_class($obj);
+    static::class;
+
+
+Upgrade parse_class_spec()
+
+
+    :::php
+    // old
+    $spec = Object::parse_class_spec($spec);
+    // new
+    $spec = ClassInfo::parse_class_spec($spec);
+
+
+Upgrade create_from_string()
+
+
+    :::php
+    // old
+    $obj = Object::create_from_string('Varchar(100)');
+    // new
+    $obj = Injector::inst()->create('Varchar(100)');
+
+
+Extensions
+
+
+    :::php
+    // old
+    Object::add_extension('File', 'Versioned');
+    $has = Object::has_extension('File', 'Versioned');
+    $extensions = Object::get_extensions('File');
+    // new
+    File::add_extension(Versioned::class);
+    $has = File::has_extension(Versioned::class)
+    $extensions = File::get_extensions();
+    
+    // new (alternate form)
+    // Note: The class the extension method is called on MUST be a parent class
+    // of the first argument.
+    DataObject::add_extension(File::class, Versioned::class); // alternate
+    $has = DataObject::has_extension(File::class, Versioned::class); // alternate
+    $extensions = DataObject::get_extensions(File::class);
+
+
 #### Compatibility with the new front-end building tools
 
 If you are using Requirements from 3.x then your scripts should continue to work as they did before.
@@ -1203,6 +1288,10 @@ After (`mysite/_config/config.yml`):
 * Introduced new ModuleLoader manifest, which allows modules to be found via composer name.
  E.g. `$cms = ModuleLoader::inst()->getManifest()->getModule('silverstripe/cms')`
 * `ClassManifest::getOwnerModule()` now returns a `Module` object instance.
+* `Object` class has been removed.
+  * `parse_class_spec` moved to `ClassInfo`
+  * `create_from_spec` functionality removed, but now supportede by `Injector` natively.
+  * `Injectable`, `Extensible` and `Configurable` traits added to support other methods.
 * Certain methods have been moved from `Controller` to `RequestHandler`:
   * `Link`
   * `redirect`

src/Control/CliController.php

@@ -32,7 +32,7 @@ abstract class CliController extends Controller
 
     public function index()
     {
-        foreach (ClassInfo::subclassesFor($this->class) as $subclass) {
+        foreach (ClassInfo::subclassesFor(static::class) as $subclass) {
             echo $subclass . "\n";
             /** @var CliController $task */
             $task = Injector::inst()->create($subclass);

src/Control/ContentNegotiator.php

@@ -3,7 +3,8 @@
 namespace SilverStripe\Control;
 
 use SilverStripe\Core\Config\Config;
-use SilverStripe\Core\Object;
+use SilverStripe\Core\Config\Configurable;
+use SilverStripe\Core\Injector\Injectable;
 
 /**
  * The content negotiator performs "text/html" or "application/xhtml+xml" switching. It does this through
@@ -31,8 +32,10 @@ use SilverStripe\Core\Object;
  * Some developers might know what they're doing and don't want ContentNegotiator messing with their
  * HTML4 doctypes, but still find it useful to have self-closing tags removed.
  */
-class ContentNegotiator extends Object
+class ContentNegotiator
 {
+    use Injectable;
+    use Configurable;
 
     /**
      * @config

src/Control/Controller.php

@@ -3,7 +3,6 @@
 namespace SilverStripe\Control;
 
 use SilverStripe\Core\ClassInfo;
-use SilverStripe\Core\Object;
 use SilverStripe\Core\Injector\Injector;
 use SilverStripe\Dev\Debug;
 use SilverStripe\ORM\DataModel;
@@ -122,8 +121,9 @@ class Controller extends RequestHandler implements TemplateGlobalProvider
         $this->baseInitCalled = false;
         $this->init();
         if (!$this->baseInitCalled) {
+            $class = static::class;
             user_error(
-                "init() method on class '$this->class' doesn't call Controller::init()."
+                "init() method on class '{$class}' doesn't call Controller::init()."
                 . "Make sure that you have parent::init() included.",
                 E_USER_WARNING
             );
@@ -231,18 +231,22 @@ class Controller extends RequestHandler implements TemplateGlobalProvider
     {
         if ($response instanceof HTTPResponse) {
             if (isset($_REQUEST['debug_request'])) {
+                $class = static::class;
                 Debug::message(
-                    "Request handler returned HTTPResponse object to $this->class controller;"
+                    "Request handler returned HTTPResponse object to {$class} controller;"
                     . "returning it without modification."
                 );
             }
             $this->setResponse($response);
         } else {
-            if ($response instanceof Object && $response->hasMethod('getViewer')) {
+            // Could be Controller, or ViewableData_Customised controller wrapper
+            if (ClassInfo::hasMethod($response, 'getViewer')) {
                 if (isset($_REQUEST['debug_request'])) {
+                    $class = static::class;
+                    $responseClass = get_class($response);
                     Debug::message(
-                        "Request handler $response->class object to $this->class controller;"
+                        "Request handler {$responseClass} object to {$class} controller;"
-                        . "rendering with template returned by $response->class::getViewer()"
+                        . "rendering with template returned by {$responseClass}::getViewer()"
                     );
                 }
                 $response = $response->getViewer($this->getAction())->process($response);
@@ -399,14 +403,14 @@ class Controller extends RequestHandler implements TemplateGlobalProvider
             // Add action-specific templates for inheritance chain
             $templates = array();
             if ($action && $action != 'index') {
-                $parentClass = $this->class;
+                $parentClass = static::class;
                 while ($parentClass != __CLASS__) {
                     $templates[] = strtok($parentClass, '_') . '_' . $action;
                     $parentClass = get_parent_class($parentClass);
                 }
             }
             // Add controller templates for inheritance chain
-            $parentClass = $this->class;
+            $parentClass = static::class;
             while ($parentClass != __CLASS__) {
                 $templates[] = strtok($parentClass, '_');
                 $parentClass = get_parent_class($parentClass);
@@ -469,7 +473,7 @@ class Controller extends RequestHandler implements TemplateGlobalProvider
             return $definingClass;
         }
 
-        $class = get_class($this);
+        $class = static::class;
         while ($class != 'SilverStripe\\Control\\RequestHandler') {
             $templateName = strtok($class, '_') . '_' . $action;
             if (SSViewer::hasTemplate($templateName)) {
@@ -496,7 +500,7 @@ class Controller extends RequestHandler implements TemplateGlobalProvider
             return true;
         }
 
-        $parentClass = $this->class;
+        $parentClass = static::class;
         $templates   = array();
 
         while ($parentClass != __CLASS__) {
@@ -614,8 +618,9 @@ class Controller extends RequestHandler implements TemplateGlobalProvider
         if ($this === self::$controller_stack[0]) {
             array_shift(self::$controller_stack);
         } else {
+            $class = static::class;
             user_error(
-                "popCurrent called on $this->class controller, but it wasn't at the top of the stack",
+                "popCurrent called on {$class} controller, but it wasn't at the top of the stack",
                 E_USER_WARNING
             );
         }

src/Control/Email/Email.php

@@ -573,7 +573,8 @@ class Email extends ViewableData
     {
         $this->render();
 
-        return "<h2>Email template {$this->class}:</h2>\n" . '<pre>' . $this->getSwiftMessage()->toString() . '</pre>';
+        $class = static::class;
+        return "<h2>Email template {$class}:</h2>\n" . '<pre>' . $this->getSwiftMessage()->toString() . '</pre>';
     }
 
     /**

src/Control/RSS/RSSFeed.php

@@ -272,7 +272,7 @@ class RSSFeed extends ViewableData
      */
     public function getTemplates()
     {
-        $templates = SSViewer::get_templates_by_class(get_class($this), '', __CLASS__);
+        $templates = SSViewer::get_templates_by_class(static::class, '', __CLASS__);
         // Prefer any custom template
         if ($this->getTemplate()) {
             array_unshift($templates, $this->getTemplate());

src/Control/RSS/RSSFeed_Entry.php

@@ -130,7 +130,7 @@ class RSSFeed_Entry extends ViewableData
         }
 
         throw new BadMethodCallException(
-            $this->failover->class .
+            get_class($this->failover) .
             " object has neither an AbsoluteLink nor a Link method." .
             " Can't put a link in the RSS feed",
             E_USER_WARNING

src/Control/RequestHandler.php

@@ -5,7 +5,6 @@ namespace SilverStripe\Control;
 use InvalidArgumentException;
 use SilverStripe\Core\ClassInfo;
 use SilverStripe\Core\Config\Config;
-use SilverStripe\Core\Object;
 use SilverStripe\Dev\Debug;
 use SilverStripe\ORM\DataModel;
 use SilverStripe\Security\Security;
@@ -164,7 +163,7 @@ class RequestHandler extends ViewableData
     {
         // $handlerClass is used to step up the class hierarchy to implement url_handlers inheritance
         if ($this->brokenOnConstruct) {
-            $handlerClass = get_class($this);
+            $handlerClass = static::class;
             throw new BadMethodCallException(
                 "parent::__construct() needs to be called on {$handlerClass}::__construct()"
             );
@@ -205,7 +204,7 @@ class RequestHandler extends ViewableData
             user_error("Non-string method name: " . var_export($action, true), E_USER_ERROR);
         }
 
-        $classMessage = Director::isLive() ? 'on this handler' : 'on class '.get_class($this);
+        $classMessage = Director::isLive() ? 'on this handler' : 'on class '.static::class;
 
         try {
             if (!$this->hasAction($action)) {
@@ -263,7 +262,7 @@ class RequestHandler extends ViewableData
      */
     protected function findAction($request)
     {
-        $handlerClass = ($this->class) ? $this->class : get_class($this);
+        $handlerClass = static::class;
 
         // We stop after RequestHandler; in other words, at ViewableData
         while ($handlerClass && $handlerClass != ViewableData::class) {
@@ -272,14 +271,18 @@ class RequestHandler extends ViewableData
             if ($urlHandlers) {
                 foreach ($urlHandlers as $rule => $action) {
                     if (isset($_REQUEST['debug_request'])) {
-                        Debug::message("Testing '$rule' with '" . $request->remaining() . "' on $this->class");
+                        $class = static::class;
+                        $remaining = $request->remaining();
+                        Debug::message("Testing '{$rule}' with '{$remaining}' on {$class}");
                     }
 
                     if ($request->match($rule, true)) {
                         if (isset($_REQUEST['debug_request'])) {
+                            $class = static::class;
+                            $latestParams = var_export($request->latestParams(), true);
                             Debug::message(
-                                "Rule '$rule' matched to action '$action' on $this->class. ".
+                                "Rule '{$rule}' matched to action '{$action}' on {$class}. ".
-                                "Latest request params: " . var_export($request->latestParams(), true)
+                                "Latest request params: {$latestParams}"
                             );
                         }
 
@@ -304,7 +307,7 @@ class RequestHandler extends ViewableData
      */
     protected function handleAction($request, $action)
     {
-        $classMessage = Director::isLive() ? 'on this handler' : 'on class '.get_class($this);
+        $classMessage = Director::isLive() ? 'on this handler' : 'on class '.static::class;
 
         if (!$this->hasMethod($action)) {
             return new HTTPResponse("Action '$action' isn't available $classMessage.", 404);
@@ -469,7 +472,7 @@ class RequestHandler extends ViewableData
                 $isAllowed = true;
             } elseif (substr($test, 0, 2) == '->') {
                 // Determined by custom method with "->" prefix
-                list($method, $arguments) = Object::parse_class_spec(substr($test, 2));
+                list($method, $arguments) = ClassInfo::parse_class_spec(substr($test, 2));
                 $isAllowed = call_user_func_array(array($this, $method), $arguments);
             } else {
                 // Value is a permission code to check the current member against
@@ -564,7 +567,7 @@ class RequestHandler extends ViewableData
 
         // no link defined by default
         trigger_error(
-            'Request handler '.get_class($this). ' does not have a url_segment defined. '.
+            'Request handler '.static::class. ' does not have a url_segment defined. '.
             'Relying on this link may be an application error',
             E_USER_WARNING
         );

src/Core/ClassInfo.php

@@ -2,6 +2,7 @@
 
 namespace SilverStripe\Core;
 
+use Exception;
 use SilverStripe\Control\Director;
 use SilverStripe\Core\Manifest\ClassLoader;
 use SilverStripe\Dev\Deprecation;
@@ -43,14 +44,26 @@ class ClassInfo
 
     /**
      * Cache for {@link hasTable()}
+     *
+     * @internal
+     * @var array
      */
     private static $_cache_all_tables = array();
 
     /**
+     * @internal
      * @var array Cache for {@link ancestry()}.
      */
     private static $_cache_ancestry = array();
 
+    /**
+     * Cache for parse_class_spec
+     *
+     * @internal
+     * @var array
+     */
+    private static $_cache_parse = [];
+
     /**
      * @todo Move this to SS_Database or DB
      *
@@ -358,4 +371,148 @@ class ClassInfo
         }
         return method_exists($object, 'hasMethod') && $object->hasMethod($method);
     }
+
+    /**
+     * Parses a class-spec, such as "Versioned('Stage','Live')", as passed to create_from_string().
+     * Returns a 2-element array, with classname and arguments
+     *
+     * @param string $classSpec
+     * @return array
+     * @throws Exception
+     */
+    public static function parse_class_spec($classSpec)
+    {
+        if (isset(static::$_cache_parse[$classSpec])) {
+            return static::$_cache_parse[$classSpec];
+        }
+
+        $tokens = token_get_all("<?php $classSpec");
+        $class = null;
+        $args = array();
+
+        // Keep track of the current bucket that we're putting data into
+        $bucket = &$args;
+        $bucketStack = array();
+        $hadNamespace = false;
+        $currentKey = null;
+
+        foreach ($tokens as $token) {
+            // $forceResult used to allow null result to be detected
+            $result = $forceResult = null;
+            $tokenName = is_array($token) ? $token[0] : $token;
+
+            // Get the class name
+            if ($class === null && is_array($token) && $token[0] === T_STRING) {
+                $class = $token[1];
+            } elseif (is_array($token) && $token[0] === T_NS_SEPARATOR) {
+                $class .= $token[1];
+                $hadNamespace = true;
+            } elseif ($hadNamespace && is_array($token) && $token[0] === T_STRING) {
+                $class .= $token[1];
+                $hadNamespace = false;
+            // Get arguments
+            } elseif (is_array($token)) {
+                switch ($token[0]) {
+                    case T_CONSTANT_ENCAPSED_STRING:
+                        $argString = $token[1];
+                        switch ($argString[0]) {
+                            case '"':
+                                $result = stripcslashes(substr($argString, 1, -1));
+                                break;
+                            case "'":
+                                $result = str_replace(array("\\\\", "\\'"), array("\\", "'"), substr($argString, 1, -1));
+                                break;
+                            default:
+                                throw new Exception("Bad T_CONSTANT_ENCAPSED_STRING arg $argString");
+                        }
+
+                        break;
+
+                    case T_DNUMBER:
+                        $result = (double)$token[1];
+                        break;
+
+                    case T_LNUMBER:
+                        $result = (int)$token[1];
+                        break;
+
+                    case T_DOUBLE_ARROW:
+                        // We've encountered an associative array (the array itself has already been
+                        // added to the bucket), so the previous item added to the bucket is the key
+                        end($bucket);
+                        $currentKey = current($bucket);
+                        array_pop($bucket);
+                        break;
+
+                    case T_STRING:
+                        switch ($token[1]) {
+                            case 'true':
+                                $result = true;
+
+                                break;
+                            case 'false':
+                                $result = false;
+
+                                break;
+                            case 'null':
+                                $result = null;
+                                $forceResult = true;
+
+                                break;
+                            default:
+                                throw new Exception("Bad T_STRING arg '{$token[1]}'");
+                        }
+
+                        break;
+
+                    case T_ARRAY:
+                        $result = array();
+                        break;
+                }
+            } else {
+                if ($tokenName === '[') {
+                    $result = array();
+                } elseif (($tokenName === ')' || $tokenName === ']') && ! empty($bucketStack)) {
+                    // Store the bucket we're currently working on
+                    $oldBucket = $bucket;
+                    // Fetch the key for the bucket at the top of the stack
+                    end($bucketStack);
+                    $key = key($bucketStack);
+                    reset($bucketStack);
+                    // Re-instate the bucket from the top of the stack
+                    $bucket = &$bucketStack[$key];
+                    // Add our saved, "nested" bucket to the bucket we just popped off the stack
+                    $bucket[$key] = $oldBucket;
+                    // Remove the bucket we just popped off the stack
+                    array_pop($bucketStack);
+                }
+            }
+
+            // If we've got something to add to the bucket, add it
+            if ($result !== null || $forceResult) {
+                if ($currentKey) {
+                    $bucket[$currentKey] = $result;
+                    $currentKey = null;
+                } else {
+                    $bucket[] = $result;
+                }
+
+                // If we've just pushed an array, that becomes our new bucket
+                if ($result === array()) {
+                    // Fetch the key that the array was pushed to
+                    end($bucket);
+                    $key = key($bucket);
+                    reset($bucket);
+                    // Store reference to "old" bucket in the stack
+                    $bucketStack[$key] = &$bucket;
+                    // Set the active bucket to be our newly-pushed, empty array
+                    $bucket = &$bucket[$key];
+                }
+            }
+        }
+
+        $result = [$class, $args];
+        static::$_cache_parse[$classSpec] = $result;
+        return $result;
+    }
 }

src/Core/Config/Middleware/ExtensionMiddleware.php

@@ -8,7 +8,6 @@ use SilverStripe\Config\MergeStrategy\Priority;
 use SilverStripe\Config\Middleware\Middleware;
 use SilverStripe\Core\ClassInfo;
 use SilverStripe\Core\Config\Config;
-use SilverStripe\Core\Object;
 
 class ExtensionMiddleware implements Middleware
 {
@@ -52,7 +51,7 @@ class ExtensionMiddleware implements Middleware
 
         $extensions = $classConfig['extensions'];
         foreach ($extensions as $extension) {
-            list($extensionClass, $extensionArgs) = Object::parse_class_spec($extension);
+            list($extensionClass, $extensionArgs) = ClassInfo::parse_class_spec($extension);
             if (!class_exists($extensionClass)) {
                 throw new InvalidArgumentException("$class references nonexistent $extensionClass in 'extensions'");
             }

src/Core/CustomMethods.php

@@ -47,7 +47,7 @@ trait CustomMethods
     {
         // If the method cache was cleared by an an Object::add_extension() / Object::remove_extension()
         // call, then we should rebuild it.
-        $class = get_class($this);
+        $class = static::class;
         if (!array_key_exists($class, self::$extra_methods)) {
             $this->defineMethods();
         }
@@ -151,12 +151,12 @@ trait CustomMethods
     /**
      * Get meta-data details on a named method
      *
-     * @param array $method
+     * @param string $method
      * @return array List of custom method details, if defined for this method
      */
     protected function getExtraMethodConfig($method)
     {
-        $class = get_class($this);
+        $class = static::class;
         if (isset(self::$extra_methods[$class][strtolower($method)])) {
             return self::$extra_methods[$class][strtolower($method)];
         }
@@ -171,7 +171,7 @@ trait CustomMethods
      */
     public function allMethodNames($custom = false)
     {
-        $class = get_class($this);
+        $class = static::class;
         if (!isset(self::$built_in_methods[$class])) {
             self::$built_in_methods[$class] = array_map('strtolower', get_class_methods($this));
         }
@@ -198,10 +198,11 @@ trait CustomMethods
                 $extension->clearOwner();
             }
         } else {
-            if (!isset(self::$built_in_methods[$extension->class])) {
+            $class = get_class($extension);
-                self::$built_in_methods[$extension->class] = array_map('strtolower', get_class_methods($extension));
+            if (!isset(self::$built_in_methods[$class])) {
+                self::$built_in_methods[$class] = array_map('strtolower', get_class_methods($extension));
             }
-            $methods = self::$built_in_methods[$extension->class];
+            $methods = self::$built_in_methods[$class];
         }
 
         return $methods;
@@ -216,7 +217,7 @@ trait CustomMethods
      */
     protected function addMethodsFrom($property, $index = null)
     {
-        $class = get_class($this);
+        $class = static::class;
         $extension = ($index !== null) ? $this->{$property}[$index] : $this->$property;
 
         if (!$extension) {
@@ -253,7 +254,7 @@ trait CustomMethods
     protected function removeMethodsFrom($property, $index = null)
     {
         $extension = ($index !== null) ? $this->{$property}[$index] : $this->$property;
-        $class = get_class($this);
+        $class = static::class;
 
         if (!$extension) {
             throw new InvalidArgumentException(
@@ -286,7 +287,7 @@ trait CustomMethods
      */
     protected function addWrapperMethod($method, $wrap)
     {
-        $class = get_class($this);
+        $class = static::class;
         self::$extra_methods[$class][strtolower($method)] = array (
             'wrap'   => $wrap,
             'method' => $method

src/Core/Extensible.php

@@ -3,8 +3,10 @@
 namespace SilverStripe\Core;
 
 use InvalidArgumentException;
+use SilverStripe\Control\RequestHandler;
 use SilverStripe\Core\Config\Config;
 use SilverStripe\Core\Injector\Injector;
+use SilverStripe\View\ViewableData;
 
 /**
  * Allows an object to have extensions applied to it.
@@ -46,9 +48,8 @@ trait Extensible
      * @var array
      */
     private static $unextendable_classes = array(
-        'SilverStripe\\Core\\Object',
+        ViewableData::class,
-        'SilverStripe\\View\\ViewableData',
+        RequestHandler::class,
-        'SilverStripe\\Control\\RequestHandler'
     );
 
     /**
@@ -110,7 +111,7 @@ trait Extensible
 
     protected function constructExtensions()
     {
-        $class = get_class($this);
+        $class = static::class;
 
         // Register this trait as a method source
         $this->registerExtraMethodCallback('defineExtensionMethods', function () {
@@ -126,9 +127,9 @@ trait Extensible
 
             if ($extensions) {
                 foreach ($extensions as $extension) {
-                    $instance = Object::create_from_string($extension);
+                    $instance = Injector::inst()->create($extension);
                     $instance->setOwner(null, $class);
-                    $this->extension_instances[$instance->class] = $instance;
+                    $this->extension_instances[get_class($instance)] = $instance;
                 }
             }
         }
@@ -177,7 +178,7 @@ trait Extensible
      */
     public static function add_extension($classOrExtension, $extension = null)
     {
-        if (func_num_args() > 1) {
+        if ($extension) {
             $class = $classOrExtension;
         } else {
             $class = get_called_class();
@@ -285,14 +286,18 @@ trait Extensible
     }
 
     /**
-     * @param string $class
+     * @param string $class If omitted, will get extensions for the current class
      * @param bool $includeArgumentString Include the argument string in the return array,
      *  FALSE would return array("Versioned"), TRUE returns array("Versioned('Stage','Live')").
      * @return array Numeric array of either {@link DataExtension} class names,
      *  or eval'ed class name strings with constructor arguments.
      */
-    public static function get_extensions($class, $includeArgumentString = false)
+    public static function get_extensions($class = null, $includeArgumentString = false)
     {
+        if (!$class) {
+            $class = get_called_class();
+        }
+
         $extensions = Config::forClass($class)->get('extensions', Config::EXCLUDE_EXTRA_SOURCES);
         if (empty($extensions)) {
             return array();
@@ -315,9 +320,15 @@ trait Extensible
     }
 
 
+    /**
+     * Get extra config sources for this class
+     *
+     * @param string $class Name of class. If left null will return for the current class
+     * @return array|null
+     */
     public static function get_extra_config_sources($class = null)
     {
-        if ($class === null) {
+        if (!$class) {
             $class = get_called_class();
         }
 
@@ -340,7 +351,7 @@ trait Extensible
         $sources = array();
 
         foreach ($extensions as $extension) {
-            list($extensionClass, $extensionArgs) = Object::parse_class_spec($extension);
+            list($extensionClass, $extensionArgs) = ClassInfo::parse_class_spec($extension);
             $sources[] = $extensionClass;
 
             if (!class_exists($extensionClass)) {
@@ -367,16 +378,16 @@ trait Extensible
      * Return TRUE if a class has a specified extension.
      * This supports backwards-compatible format (static Object::has_extension($requiredExtension))
      * and new format ($object->has_extension($class, $requiredExtension))
-     * @param string $classOrExtension if 1 argument supplied, the class name of the extension to
+     * @param string $classOrExtension Class to check extension for, or the extension name to check
-     *                               check for; if 2 supplied, the class name to test
+     * if the second argument is null.
-     * @param string $requiredExtension used only if 2 arguments supplied
+     * @param string $requiredExtension If the first argument is the parent class, this is the extension to check.
+     * If left null, the first parameter will be treated as the extension.
      * @param boolean $strict if the extension has to match the required extension and not be a subclass
      * @return bool Flag if the extension exists
      */
     public static function has_extension($classOrExtension, $requiredExtension = null, $strict = false)
     {
-        //BC support
+        if ($requiredExtension) {
-        if (func_num_args() > 1) {
             $class = $classOrExtension;
         } else {
             $class = get_called_class();
@@ -500,6 +511,7 @@ trait Extensible
         if ($this->hasExtension($extension)) {
             return $this->extension_instances[$extension];
         }
+        return null;
     }
 
     /**

src/Core/Extension.php

@@ -16,7 +16,6 @@ use SilverStripe\ORM\DataObject;
  */
 abstract class Extension
 {
-
     /**
      * This is used by extensions designed to be applied to controllers.
      * It works the same way as {@link Controller::$allowed_actions}.
@@ -45,13 +44,6 @@ abstract class Extension
      */
     private $ownerStack = [];
 
-    public $class;
-
-    public function __construct()
-    {
-        $this->class = get_class($this);
-    }
-
     /**
      * Called when this extension is added to a particular class
      *
@@ -67,7 +59,7 @@ abstract class Extension
     /**
      * Set the owner of this extension.
      *
-     * @param Object $owner The owner object,
+     * @param object $owner The owner object,
      * @param string $ownerBaseClass The base class that the extension is applied to; this may be
      * the class of owner, or it may be a parent.  For example, if Versioned was applied to SiteTree,
      * and then a Page object was instantiated, $owner would be a Page object, but $ownerBaseClass

src/Core/Injector/Injectable.php

@@ -20,22 +20,13 @@ trait Injectable
      *    $list = DataList::create('SiteTree');
      *    $list = SiteTree::get();
      *
-     * @param string $classOrArgument The first argument, or class name (if called directly
+     * @param array $args
-     * on Object).
-     * @param mixed $argument,... arguments to pass to the constructor
      * @return static
      */
-    public static function create($classOrArgument = null, $argument = null)
+    public static function create(...$args)
     {
-        $args = func_get_args();
+        // Class to create should be the calling class
-
-        // Class to create should be the calling class if not Object,
-        // otherwise the first parameter
         $class = get_called_class();
-        if ($class == 'SilverStripe\\Core\\Object') {
-            $class = array_shift($args);
-        }
-
         return Injector::inst()->createWithArgs($class, $args);
     }
 

src/Core/Injector/Injector.php

@@ -3,6 +3,7 @@
 namespace SilverStripe\Core\Injector;
 
 use Psr\Container\NotFoundExceptionInterface;
+use SilverStripe\Core\ClassInfo;
 use SilverStripe\Core\Config\Config;
 use ReflectionProperty;
 use ArrayObject;
@@ -828,7 +829,7 @@ class Injector implements ContainerInterface
      */
     public function getServiceName($name)
     {
-        // common case, get it over with first
+        // common case, get it overwith first
         if (isset($this->specs[$name])) {
             return $name;
         }
@@ -902,7 +903,7 @@ class Injector implements ContainerInterface
      * if this object is to be created from scratch (with $asSingleton = false)
      * @return mixed Instance of the specified object
      */
-    public function get($name, $asSingleton = true, $constructorArgs = null)
+    public function get($name, $asSingleton = true, $constructorArgs = [])
     {
         $object = $this->getNamedService($name, $asSingleton, $constructorArgs);
 
@@ -921,8 +922,11 @@ class Injector implements ContainerInterface
      * @param array $constructorArgs
      * @return mixed|null Instance of the specified object (if it exists)
      */
-    protected function getNamedService($name, $asSingleton = true, $constructorArgs = null)
+    protected function getNamedService($name, $asSingleton = true, $constructorArgs = [])
     {
+        // Normalise service / args
+        list($name, $constructorArgs) = $this->normaliseArguments($name, $constructorArgs);
+
         // reassign the name as it might actually be a compound name
         if ($serviceName = $this->getServiceName($name)) {
             // check to see what the type of bean is. If it's a prototype,
@@ -974,6 +978,28 @@ class Injector implements ContainerInterface
         return $this->instantiate($spec);
     }
 
+    /**
+     * Detect service references with constructor arguments included.
+     * These will be split out of the service name reference and appended
+     * to the $args
+     *
+     * @param string $name
+     * @param array $args
+     * @return array Two items with name and new args
+     */
+    protected function normaliseArguments($name, $args = [])
+    {
+        if (strstr($name, '(')) {
+            list($name, $extraArgs) = ClassInfo::parse_class_spec($name);
+            if ($args) {
+                $args = array_merge($args, $extraArgs);
+            } else {
+                $args = $extraArgs;
+            }
+        }
+        return [ $name, $args ];
+    }
+
     /**
      * Magic method to return an item directly
      *
@@ -999,7 +1025,7 @@ class Injector implements ContainerInterface
     {
         $constructorArgs = func_get_args();
         array_shift($constructorArgs);
-        return $this->get($name, false, count($constructorArgs) ? $constructorArgs : null);
+        return $this->createWithArgs($name, $constructorArgs);
     }
 
     /**

src/Core/Object.php

@@ -1,324 +0,0 @@
-<?php
-
-namespace SilverStripe\Core;
-
-use SilverStripe\Core\Injector\Injectable;
-use SilverStripe\Core\Config\Configurable;
-use Exception;
-use ReflectionClass;
-
-/**
- * A base class for all SilverStripe objects to inherit from.
- *
- * This class provides a number of pattern implementations, as well as methods and fixes to add extra psuedo-static
- * and method functionality to PHP.
- *
- * See {@link Extension} on how to implement a custom multiple
- * inheritance for object instances based on PHP5 method call overloading.
- *
- * @todo Create instance-specific removeExtension() which removes an extension from $extension_instances,
- * but not from static $extensions, and clears everything added through defineMethods(), mainly $extra_methods.
- */
-abstract class Object
-{
-    use Extensible;
-    use Injectable;
-    use Configurable;
-
-    /**
-     * @var string the class name
-     */
-    public $class;
-
-    private static $_cache_inst_args = array();
-
-    /**
-     * Create an object from a string representation.  It treats it as a PHP constructor without the
-     * 'new' keyword.  It also manages to construct the object without the use of eval().
-     *
-     * Construction itself is done with Object::create(), so that Object::useCustomClass() calls
-     * are respected.
-     *
-     * `Object::create_from_string("Versioned('Stage','Live')")` will return the result of
-     * `Versioned::create('Stage', 'Live);`
-     *
-     * It is designed for simple, cloneable objects.  The first time this method is called for a given
-     * string it is cached, and clones of that object are returned.
-     *
-     * If you pass the $firstArg argument, this will be prepended to the constructor arguments. It's
-     * impossible to pass null as the firstArg argument.
-     *
-     * `Object::create_from_string("Varchar(50)", "MyField")` will return the result of
-     * `Varchar::create('MyField', '50');`
-     *
-     * Arguments are always strings, although this is a quirk of the current implementation rather
-     * than something that can be relied upon.
-     *
-     * @param string $classSpec
-     * @param mixed $firstArg
-     * @return object
-     */
-    public static function create_from_string($classSpec, $firstArg = null)
-    {
-        if (!isset(self::$_cache_inst_args[$classSpec.$firstArg])) {
-            // an $extension value can contain parameters as a string,
-            // e.g. "Versioned('Stage','Live')"
-            if (strpos($classSpec, '(') === false) {
-                if ($firstArg === null) {
-                    self::$_cache_inst_args[$classSpec.$firstArg] = Object::create($classSpec);
-                } else {
-                    self::$_cache_inst_args[$classSpec.$firstArg] = Object::create($classSpec, $firstArg);
-                }
-            } else {
-                list($class, $args) = self::parse_class_spec($classSpec);
-
-                if ($firstArg !== null) {
-                    array_unshift($args, $firstArg);
-                }
-                array_unshift($args, $class);
-
-                self::$_cache_inst_args[$classSpec.$firstArg] = call_user_func_array(array('SilverStripe\\Core\\Object','create'), $args);
-            }
-        }
-
-        return clone self::$_cache_inst_args[$classSpec.$firstArg];
-    }
-
-    /**
-     * Parses a class-spec, such as "Versioned('Stage','Live')", as passed to create_from_string().
-     * Returns a 2-element array, with classname and arguments
-     *
-     * @param string $classSpec
-     * @return array
-     * @throws Exception
-     */
-    public static function parse_class_spec($classSpec)
-    {
-        $tokens = token_get_all("<?php $classSpec");
-        $class = null;
-        $args = array();
-
-        // Keep track of the current bucket that we're putting data into
-        $bucket = &$args;
-        $bucketStack = array();
-        $hadNamespace = false;
-        $currentKey = null;
-
-        foreach ($tokens as $token) {
-            // $forceResult used to allow null result to be detected
-            $result = $forceResult = null;
-            $tokenName = is_array($token) ? $token[0] : $token;
-
-            // Get the class name
-            if ($class === null && is_array($token) && $token[0] === T_STRING) {
-                $class = $token[1];
-            } elseif (is_array($token) && $token[0] === T_NS_SEPARATOR) {
-                $class .= $token[1];
-                $hadNamespace = true;
-            } elseif ($hadNamespace && is_array($token) && $token[0] === T_STRING) {
-                $class .= $token[1];
-                $hadNamespace = false;
-            // Get arguments
-            } elseif (is_array($token)) {
-                switch ($token[0]) {
-                    case T_CONSTANT_ENCAPSED_STRING:
-                        $argString = $token[1];
-                        switch ($argString[0]) {
-                            case '"':
-                                $result = stripcslashes(substr($argString, 1, -1));
-                                break;
-                            case "'":
-                                $result = str_replace(array("\\\\", "\\'"), array("\\", "'"), substr($argString, 1, -1));
-                                break;
-                            default:
-                                throw new Exception("Bad T_CONSTANT_ENCAPSED_STRING arg $argString");
-                        }
-
-                        break;
-
-                    case T_DNUMBER:
-                        $result = (double)$token[1];
-                        break;
-
-                    case T_LNUMBER:
-                        $result = (int)$token[1];
-                        break;
-
-                    case T_DOUBLE_ARROW:
-                        // We've encountered an associative array (the array itself has already been
-                        // added to the bucket), so the previous item added to the bucket is the key
-                        end($bucket);
-                        $currentKey = current($bucket);
-                        array_pop($bucket);
-                        break;
-
-                    case T_STRING:
-                        switch ($token[1]) {
-                            case 'true':
-                                $result = true;
-
-                                break;
-                            case 'false':
-                                $result = false;
-
-                                break;
-                            case 'null':
-                                $result = null;
-                                $forceResult = true;
-
-                                break;
-                            default:
-                                throw new Exception("Bad T_STRING arg '{$token[1]}'");
-                        }
-
-                        break;
-
-                    case T_ARRAY:
-                        $result = array();
-                        break;
-                }
-            } else {
-                if ($tokenName === '[') {
-                    $result = array();
-                } elseif (($tokenName === ')' || $tokenName === ']') && ! empty($bucketStack)) {
-                    // Store the bucket we're currently working on
-                    $oldBucket = $bucket;
-                    // Fetch the key for the bucket at the top of the stack
-                    end($bucketStack);
-                    $key = key($bucketStack);
-                    reset($bucketStack);
-                    // Re-instate the bucket from the top of the stack
-                    $bucket = &$bucketStack[$key];
-                    // Add our saved, "nested" bucket to the bucket we just popped off the stack
-                    $bucket[$key] = $oldBucket;
-                    // Remove the bucket we just popped off the stack
-                    array_pop($bucketStack);
-                }
-            }
-
-            // If we've got something to add to the bucket, add it
-            if ($result !== null || $forceResult) {
-                if ($currentKey) {
-                    $bucket[$currentKey] = $result;
-                    $currentKey = null;
-                } else {
-                    $bucket[] = $result;
-                }
-
-                // If we've just pushed an array, that becomes our new bucket
-                if ($result === array()) {
-                    // Fetch the key that the array was pushed to
-                    end($bucket);
-                    $key = key($bucket);
-                    reset($bucket);
-                    // Store reference to "old" bucket in the stack
-                    $bucketStack[$key] = &$bucket;
-                    // Set the active bucket to be our newly-pushed, empty array
-                    $bucket = &$bucket[$key];
-                }
-            }
-        }
-
-        return array($class, $args);
-    }
-
-    /**
-     * Get the value of a static property of a class, even in that property is declared protected (but not private),
-     * without any inheritance, merging or parent lookup if it doesn't exist on the given class.
-     *
-     * @param string $class The class to get the static from
-     * @param string $name The property to get from the class
-     * @param mixed $default The value to return if property doesn't exist on class
-     * @return mixed The value of the static property $name on class $class,
-     * or $default if that property is not defined
-     */
-    public static function static_lookup($class, $name, $default = null)
-    {
-        if (is_subclass_of($class, 'SilverStripe\\Core\\Object')) {
-            if (isset($class::$$name)) {
-                $parent = get_parent_class($class);
-                if (!$parent || !isset($parent::$$name) || $parent::$$name !== $class::$$name) {
-                    return $class::$$name;
-                }
-            }
-            return $default;
-        } else {
-            // TODO: This gets set once, then not updated, so any changes to statics after this is called the first
-            // time for any class won't be exposed
-            static $static_properties = array();
-
-            if (!isset($static_properties[$class])) {
-                $reflection = new ReflectionClass($class);
-                $static_properties[$class] = $reflection->getStaticProperties();
-            }
-
-            if (isset($static_properties[$class][$name])) {
-                $value = $static_properties[$class][$name];
-
-                $parent = get_parent_class($class);
-                if (!$parent) {
-                    return $value;
-                }
-
-                if (!isset($static_properties[$parent])) {
-                    $reflection = new ReflectionClass($parent);
-                    $static_properties[$parent] = $reflection->getStaticProperties();
-                }
-
-                if (!isset($static_properties[$parent][$name]) || $static_properties[$parent][$name] !== $value) {
-                    return $value;
-                }
-            }
-        }
-
-        return $default;
-    }
-
-    public function __construct()
-    {
-        $this->class = get_class($this);
-        $this->constructExtensions();
-    }
-
-    // --------------------------------------------------------------------------------------------------------------
-
-    /**
-     * Return true if this object "exists" i.e. has a sensible value
-     *
-     * This method should be overriden in subclasses to provide more context about the classes state. For example, a
-     * {@link DataObject} class could return false when it is deleted from the database
-     *
-     * @return bool
-     */
-    public function exists()
-    {
-        return true;
-    }
-
-    /**
-     * @return string this classes parent class
-     */
-    public function parentClass()
-    {
-        return get_parent_class($this);
-    }
-
-    /**
-     * Check if this class is an instance of a specific class, or has that class as one of its parents
-     *
-     * @param string $class
-     * @return bool
-     */
-    public function is_a($class)
-    {
-        return $this instanceof $class;
-    }
-
-    /**
-     * @return string the class name
-     */
-    public function __toString()
-    {
-        return $this->class;
-    }
-}

src/Dev/BuildTask.php

@@ -3,7 +3,9 @@
 namespace SilverStripe\Dev;
 
 use SilverStripe\Control\HTTPRequest;
-use SilverStripe\Core\Object;
+use SilverStripe\Core\Config\Configurable;
+use SilverStripe\Core\Extensible;
+use SilverStripe\Core\Injector\Injectable;
 
 /**
  * Interface for a generic build task. Does not support dependencies. This will simply
@@ -12,8 +14,16 @@ use SilverStripe\Core\Object;
  * To disable the task (in the case of potentially destructive updates or deletes), declare
  * the $Disabled property on the subclass.
  */
-abstract class BuildTask extends Object
+abstract class BuildTask
 {
+    use Injectable;
+    use Configurable;
+    use Extensible;
+
+    public function __construct()
+    {
+        $this->constructExtensions();
+    }
 
     /**
      * Set a custom url segment (to follow dev/tasks/)
@@ -63,7 +73,7 @@ abstract class BuildTask extends Object
      */
     public function getTitle()
     {
-        return ($this->title) ? $this->title : $this->class;
+        return $this->title ?: static::class;
     }
 
     /**

src/Dev/BulkLoader.php

@@ -200,7 +200,8 @@ abstract class BulkLoader extends ViewableData
      */
     public function Title()
     {
-        return ($title = $this->stat('title')) ? $title : $this->class;
+        $title = $this->stat('title');
+        return $title ?: static::class;
     }
 
     /**

src/Dev/BulkLoader_Result.php

@@ -2,7 +2,7 @@
 
 namespace SilverStripe\Dev;
 
-use SilverStripe\Core\Object;
+use SilverStripe\Core\Injector\Injectable;
 use SilverStripe\ORM\ArrayList;
 use SilverStripe\ORM\DataObject;
 use SilverStripe\View\ArrayData;
@@ -15,8 +15,9 @@ use SilverStripe\View\ArrayData;
  *
  * @author Ingo Schommer, Silverstripe Ltd. (<firstname>@silverstripe.com)
  */
-class BulkLoader_Result extends Object
+class BulkLoader_Result
 {
+    use Injectable;
 
     /**
      * Stores a map of ID and ClassNames
@@ -139,7 +140,7 @@ class BulkLoader_Result extends Object
     {
         $this->created[] = $this->lastChange = array(
             'ID' => $obj->ID,
-            'ClassName' => $obj->class,
+            'ClassName' => get_class($obj),
             'Message' => $message
         );
         $this->lastChange['ChangeType'] = 'created';
@@ -153,7 +154,7 @@ class BulkLoader_Result extends Object
     {
         $this->updated[] = $this->lastChange = array(
             'ID' => $obj->ID,
-            'ClassName' => $obj->class,
+            'ClassName' => get_class($obj),
             'Message' => $message
         );
         $this->lastChange['ChangeType'] = 'updated';

src/Dev/CLI.php

@@ -2,13 +2,11 @@
 
 namespace SilverStripe\Dev;
 
-use SilverStripe\Core\Object;
-
 /**
  * Class to facilitate command-line output.
  * Support less-trivial output stuff such as colours (on xterm-color)
  */
-class CLI extends Object
+class CLI
 {
     /**
      * Returns true if the current STDOUT supports the use of colour control codes.

src/Dev/CSSContentParser.php

@@ -2,7 +2,7 @@
 
 namespace SilverStripe\Dev;
 
-use SilverStripe\Core\Object;
+use SilverStripe\Core\Injector\Injectable;
 use SimpleXMLElement;
 use tidy;
 use Exception;
@@ -22,8 +22,10 @@ use Exception;
  * Caution: Doesn't fully support HTML elements like <header>
  * due to them being declared illegal by the "tidy" preprocessing step.
  */
-class CSSContentParser extends Object
+class CSSContentParser
 {
+    use Injectable;
+
     protected $simpleXML = null;
 
     public function __construct($content)
@@ -59,8 +61,6 @@ class CSSContentParser extends Object
             throw new Exception('CSSContentParser::__construct(): Could not parse content.'
                 . ' Please check the PHP extension tidy is installed.');
         }
-
-        parent::__construct();
     }
 
     /**

src/Dev/CSVParser.php

@@ -2,7 +2,7 @@
 
 namespace SilverStripe\Dev;
 
-use SilverStripe\Core\Object;
+use SilverStripe\Core\Injector\Injectable;
 use Iterator;
 
 use SilverStripe\Control\Director;
@@ -31,8 +31,9 @@ use SilverStripe\Control\Director;
  * }
  * </code>
  */
-class CSVParser extends Object implements Iterator
+class CSVParser implements Iterator
 {
+    use Injectable;
 
     /**
      * @var string $filename
@@ -117,8 +118,6 @@ class CSVParser extends Object implements Iterator
         $this->filename = $filename;
         $this->delimiter = $delimiter;
         $this->enclosure = $enclosure;
-
-        parent::__construct();
     }
 
     /**

src/Dev/CsvBulkLoader.php

@@ -180,7 +180,7 @@ class CsvBulkLoader extends BulkLoader
      */
     protected function processChunk($filepath, $preview = false)
     {
-        $results = new BulkLoader_Result();
+        $results = BulkLoader_Result::create();
 
         $csv = new CSVParser(
             $filepath,

src/Dev/DebugView.php

@@ -5,15 +5,18 @@ namespace SilverStripe\Dev;
 use SilverStripe\Control\Controller;
 use SilverStripe\Control\Director;
 use SilverStripe\Control\HTTPRequest;
+use SilverStripe\Core\Config\Configurable;
 use SilverStripe\Core\Convert;
-use SilverStripe\Core\Object;
+use SilverStripe\Core\Injector\Injectable;
 
 /**
  * A basic HTML wrapper for stylish rendering of a developement info view.
  * Used to output error messages, and test results.
  */
-class DebugView extends Object
+class DebugView
 {
+    use Configurable;
+    use Injectable;
 
     /**
      * Column size to wrap long strings to

src/Dev/FixtureBlueprint.php

@@ -2,6 +2,7 @@
 
 namespace SilverStripe\Dev;
 
+use SilverStripe\Assets\File;
 use SilverStripe\ORM\DataModel;
 use SilverStripe\ORM\DB;
 use SilverStripe\ORM\DataObject;
@@ -85,8 +86,8 @@ class FixtureBlueprint
         // which they are imported doesnt guarantee valid relations until after the import is complete.
         // Also disable filesystem manipulations
         Config::nest();
-        Config::inst()->update('SilverStripe\\ORM\\DataObject', 'validation_enabled', false);
+        Config::modify()->set(DataObject::class, 'validation_enabled', false);
-        Config::inst()->update('SilverStripe\\Assets\\File', 'update_filesystem', false);
+        Config::modify()->set(File::class, 'update_filesystem', false);
 
         $this->invokeCallbacks('beforeCreate', array($identifier, &$data, &$fixtures));
 

src/Dev/FunctionalTest.php

@@ -83,7 +83,7 @@ class FunctionalTest extends SapphireTest
     protected function setUp()
     {
         // Skip calling FunctionalTest directly.
-        if (get_class($this) == __CLASS__) {
+        if (static::class == __CLASS__) {
             $this->markTestSkipped(sprintf('Skipping %s ', get_class($this)));
         }
 

src/Dev/SapphireTest.php

@@ -111,13 +111,14 @@ class SapphireTest extends PHPUnit_Framework_TestCase
      */
     protected $requireDefaultRecordsFrom = array();
 
-
     /**
      * A list of extensions that can't be applied during the execution of this run.  If they are
      * applied, they will be temporarily removed and a database migration called.
      *
      * The keys of the are the classes that the extensions can't be applied the extensions to, and
      * the values are an array of illegal extensions on that class.
+     *
+     * Set a class to `*` to remove all extensions (unadvised)
      */
     protected static $illegal_extensions = [];
 
@@ -242,7 +243,7 @@ class SapphireTest extends PHPUnit_Framework_TestCase
         }
 
         // We cannot run the tests on this abstract class.
-        if (get_class($this) == __CLASS__) {
+        if (static::class == __CLASS__) {
             $this->markTestSkipped(sprintf('Skipping %s ', get_class($this)));
             return;
         }
@@ -357,6 +358,9 @@ class SapphireTest extends PHPUnit_Framework_TestCase
             if (!class_exists($class)) {
                 continue;
             }
+            if ($extensions === '*') {
+                $extensions = $class::get_extensions();
+            }
             foreach ($extensions as $extension) {
                 if (!class_exists($extension) || !$class::has_extension($extension)) {
                     continue;

src/Dev/YamlFixture.php

@@ -4,7 +4,7 @@ namespace SilverStripe\Dev;
 
 use SilverStripe\Control\Director;
 use SilverStripe\Core\ClassInfo;
-use SilverStripe\Core\Object;
+use SilverStripe\Core\Injector\Injectable;
 use Symfony\Component\Yaml\Parser;
 use InvalidArgumentException;
 
@@ -68,8 +68,9 @@ use InvalidArgumentException;
  *      ErrorCode: 404
  * </code>
  */
-class YamlFixture extends Object
+class YamlFixture
 {
+    use Injectable;
 
     /**
      * Absolute path to the .yml fixture file
@@ -104,8 +105,6 @@ class YamlFixture extends Object
 
             $this->fixtureFile = $fixture;
         }
-
-        parent::__construct();
     }
 
     /**

src/Forms/CompositeField.php

@@ -246,9 +246,14 @@ class CompositeField extends FormField
                 if ($name) {
                     $formName = (isset($this->form)) ? $this->form->FormName() : '(unknown form)';
                     if (isset($list[$name])) {
-                        user_error("collateDataFields() I noticed that a field called '$name' appears twice in"
+                        $fieldClass = get_class($field);
-                            . " your form: '{$formName}'.  One is a '{$field->class}' and the other is a"
+                        $otherFieldClass = $list[$name]->class;
-                            . " '{$list[$name]->class}'", E_USER_ERROR);
+                        user_error(
+                            "collateDataFields() I noticed that a field called '$name' appears twice in"
+                             . " your form: '{$formName}'.  One is a '{$fieldClass}' and the other is a"
+                             . " '{$otherFieldClass}'",
+                            E_USER_ERROR
+                        );
                     }
                     $list[$name] = $field;
                 }
@@ -509,7 +514,8 @@ class CompositeField extends FormField
 
     public function debug()
     {
-        $result = "$this->class ($this->name) <ul>";
+        $class = static::class;
+        $result = "$class ($this->name) <ul>";
         foreach ($this->children as $child) {
             $result .= "<li>" . Debug::text($child) . "&nbsp;</li>";
         }

src/Forms/FieldList.php

@@ -347,8 +347,12 @@ class FieldList extends ArrayList
                     $withName = $parentPointer instanceof FormField
                         ? " named '{$parentPointer->getName()}'"
                         : null;
-                    user_error("FieldList::addFieldToTab() Tried to add a tab to object"
+                    $parentPointerClass = get_class($parentPointer);
-                        . " '{$parentPointer->class}'{$withName} - '$part' didn't exist.", E_USER_ERROR);
+                    user_error(
+                        "FieldList::addFieldToTab() Tried to add a tab to object"
+                        . " '{$parentPointerClass}'{$withName} - '{$part}' didn't exist.",
+                        E_USER_ERROR
+                    );
                 }
             }
         }
@@ -379,8 +383,9 @@ class FieldList extends ArrayList
                     if ($child instanceof CompositeField) {
                         return $child->fieldByName($remainder);
                     } else {
+                        $childClass = get_class($child);
                         user_error(
-                            "Trying to get field '$remainder' from non-composite field $child->class.$name",
+                            "Trying to get field '{$remainder}' from non-composite field {$childClass}.{$name}",
                             E_USER_WARNING
                         );
                         return null;

src/Forms/FileField.php

@@ -2,10 +2,10 @@
 
 namespace SilverStripe\Forms;
 
+use SilverStripe\Core\Injector\Injector;
 use SilverStripe\ORM\DataObject;
 use SilverStripe\ORM\DataObjectInterface;
 use SilverStripe\Assets\File;
-use SilverStripe\Core\Object;
 
 /**
  * Represents a file type which can be added to a form.
@@ -104,15 +104,15 @@ class FileField extends FormField implements FileHandleField
             $objectClass = DataObject::getSchema()->hasOneComponent(get_class($record), $this->name);
             if ($objectClass === File::class || empty($objectClass)) {
                 // Create object of the appropriate file class
-                $file = Object::create($fileClass);
+                $file = Injector::inst()->create($fileClass);
             } else {
                 // try to create a file matching the relation
-                $file = Object::create($objectClass);
+                $file = Injector::inst()->create($objectClass);
             }
         } elseif ($record instanceof File) {
             $file = $record;
         } else {
-            $file = Object::create($fileClass);
+            $file = Injector::inst()->create($fileClass);
         }
 
         $this->upload->loadIntoFile($_FILES[$this->name], $file, $this->getFolderName());

src/Forms/FileUploadReceiver.php

@@ -6,7 +6,7 @@ use Exception;
 use InvalidArgumentException;
 use SilverStripe\Assets\File;
 use SilverStripe\Assets\Storage\AssetContainer;
-use SilverStripe\Core\Object;
+use SilverStripe\Core\Injector\Injector;
 use SilverStripe\ORM\ArrayList;
 use SilverStripe\ORM\DataObject;
 use SilverStripe\ORM\DataObjectInterface;
@@ -308,7 +308,7 @@ trait FileUploadReceiver
                 );
             }
             // Create new object explicitly. Otherwise rely on Upload::load to choose the class.
-            $fileObject = Object::create($relationClass);
+            $fileObject = Injector::inst()->create($relationClass);
             if (! ($fileObject instanceof DataObject) || !($fileObject instanceof AssetContainer)) {
                 throw new InvalidArgumentException("Invalid asset container $relationClass");
             }

src/Forms/Form.php

@@ -942,7 +942,7 @@ class Form extends ViewableData implements HasRequestHandler
      */
     public function getTemplates()
     {
-        $templates = SSViewer::get_templates_by_class(get_class($this), '', __CLASS__);
+        $templates = SSViewer::get_templates_by_class(static::class, '', __CLASS__);
         // Prefer any custom template
         if ($this->getTemplate()) {
             array_unshift($templates, $this->getTemplate());
@@ -1702,7 +1702,8 @@ class Form extends ViewableData implements HasRequestHandler
 
     public function debug()
     {
-        $result = "<h3>$this->class</h3><ul>";
+        $class = static::class;
+        $result = "<h3>$class</h3><ul>";
         foreach ($this->fields as $field) {
             $result .= "<li>$field" . $field->debug() . "</li>";
         }

src/Forms/FormField.php

@@ -1140,7 +1140,7 @@ class FormField extends RequestHandler
      */
     protected function _templates($customTemplate = null, $customTemplateSuffix = null)
     {
-        $templates = SSViewer::get_templates_by_class(get_class($this), $customTemplateSuffix, __CLASS__);
+        $templates = SSViewer::get_templates_by_class(static::class, $customTemplateSuffix, __CLASS__);
         // Prefer any custom template
         if ($customTemplate) {
             // Prioritise direct template
@@ -1278,7 +1278,7 @@ class FormField extends RequestHandler
      */
     public function performDisabledTransformation()
     {
-        $disabledClassName = $this->class . '_Disabled';
+        $disabledClassName = static::class . '_Disabled';
 
         if (ClassInfo::exists($disabledClassName)) {
             $clone = $this->castedCopy($disabledClassName);
@@ -1310,7 +1310,7 @@ class FormField extends RequestHandler
     {
         $patten = '/' . strtolower($class) . '/i';
 
-        $subject = strtolower($this->class . ' ' . $this->extraClass());
+        $subject = strtolower(static::class . ' ' . $this->extraClass());
 
         return preg_match($patten, $subject);
     }
@@ -1377,7 +1377,7 @@ class FormField extends RequestHandler
     {
         return sprintf(
             '%s (%s: %s : <span style="color:red;">%s</span>) = %s',
-            $this->class,
+            static::class,
             $this->name,
             $this->title,
             $this->message,
@@ -1435,12 +1435,13 @@ class FormField extends RequestHandler
      */
     public function rootFieldList()
     {
-        if (is_object($this->containerFieldList)) {
+        if ($this->containerFieldList) {
             return $this->containerFieldList->rootFieldList();
         }
 
+        $class = static::class;
         user_error(
-            "rootFieldList() called on $this->class object without a containerFieldList",
+            "rootFieldList() called on {$class} object without a containerFieldList",
             E_USER_ERROR
         );
 

src/Forms/FormRequestHandler.php

@@ -258,7 +258,7 @@ class FormRequestHandler extends RequestHandler
         if ($legacyActions) {
             throw new BadMethodCallException(
                 "allowed_actions are not valid on Form class " . get_class($this->form) .
-                ". Implement these in subclasses of " . get_class($this) . " instead"
+                ". Implement these in subclasses of " . static::class . " instead"
             );
         }
 

src/Forms/FormScaffolder.php

@@ -2,7 +2,8 @@
 
 namespace SilverStripe\Forms;
 
-use SilverStripe\Core\Object;
+use SilverStripe\Core\Injector\Injectable;
+use SilverStripe\Core\Injector\Injector;
 use SilverStripe\Forms\GridField\GridField;
 use SilverStripe\Forms\GridField\GridFieldConfig_RelationEditor;
 use SilverStripe\ORM\DataObject;
@@ -11,8 +12,9 @@ use SilverStripe\ORM\DataObject;
  * @uses DBField::scaffoldFormField()
  * @uses DataObject::fieldLabels()
  */
-class FormScaffolder extends Object
+class FormScaffolder
 {
+    use Injectable;
 
     /**
      * @var DataObject $obj The object defining the fields to be scaffolded
@@ -58,7 +60,6 @@ class FormScaffolder extends Object
     public function __construct($obj)
     {
         $this->obj = $obj;
-        parent::__construct();
     }
 
     /**
@@ -151,7 +152,7 @@ class FormScaffolder extends Object
                         ? $this->fieldClasses[$relationship]
                         : 'SilverStripe\\Forms\\GridField\\GridField';
                     /** @var GridField $grid */
-                    $grid = Object::create(
+                    $grid = Injector::inst()->create(
                         $fieldClass,
                         $relationship,
                         $this->obj->fieldLabel($relationship),
@@ -181,7 +182,7 @@ class FormScaffolder extends Object
                         : 'SilverStripe\\Forms\\GridField\\GridField';
 
                     /** @var GridField $grid */
-                    $grid = Object::create(
+                    $grid = Injector::inst()->create(
                         $fieldClass,
                         $relationship,
                         $this->obj->fieldLabel($relationship),

src/Forms/FormTransformation.php

@@ -2,9 +2,11 @@
 
 namespace SilverStripe\Forms;
 
+use BadMethodCallException;
 use SilverStripe\Core\ClassInfo;
-use SilverStripe\Core\Object;
+use SilverStripe\Core\Config\Configurable;
-use SilverStripe\Dev\Debug;
+use SilverStripe\Core\Extensible;
+use SilverStripe\Core\Injector\Injectable;
 
 /**
  * This class represents "transformations" of a form - such as making it printable or making it readonly.
@@ -18,8 +20,17 @@ use SilverStripe\Dev\Debug;
  *
  * To actually perform the transformation, call $form->transform(new MyTransformation());
  */
-class FormTransformation extends Object
+class FormTransformation
 {
+    use Configurable;
+    use Injectable;
+    use Extensible;
+
+    public function __construct()
+    {
+        $this->constructExtensions();
+    }
+
     public function transform(FormField $field)
     {
         // Look for a performXXTransformation() method on the field itself.
@@ -34,13 +45,13 @@ class FormTransformation extends Object
             function ($name) {
                 return ClassInfo::shortName($name);
             },
-            array_values(ClassInfo::ancestry($this->class))
+            array_values(ClassInfo::ancestry($this))
         ));
         $fieldClasses = array_reverse(array_map(
             function ($name) {
                 return ClassInfo::shortName($name);
             },
-            array_values(ClassInfo::ancestry($field->class))
+            array_values(ClassInfo::ancestry($field))
         ));
 
         $len = max(sizeof($transNames), sizeof($fieldClasses));
@@ -64,6 +75,8 @@ class FormTransformation extends Object
             }
         }
 
-        throw new \BadMethodCallException("FormTransformation:: Can't perform '$this->class' on '$field->class'");
+        $class = static::class;
+        $fieldClass = get_class($field);
+        throw new BadMethodCallException("FormTransformation:: Can't perform '{$class}' on '{$fieldClass}'");
     }
 }

src/Forms/GridField/GridFieldConfig.php

@@ -2,8 +2,10 @@
 
 namespace SilverStripe\Forms\GridField;
 
+use SilverStripe\Core\Config\Configurable;
+use SilverStripe\Core\Extensible;
+use SilverStripe\Core\Injector\Injectable;
 use SilverStripe\ORM\ArrayList;
-use SilverStripe\Core\Object;
 
 /**
  * Encapsulates a collection of components following the
@@ -22,22 +24,21 @@ use SilverStripe\Core\Object;
  * - {@link GridFieldConfig_RecordEditor}
  * - {@link GridFieldConfig_RelationEditor}
  */
-class GridFieldConfig extends Object
+class GridFieldConfig
 {
+    use Injectable;
+    use Extensible;
+    use Configurable;
 
     /**
      * @var ArrayList
      */
     protected $components = null;
 
-
-    /**
-     *
-     */
     public function __construct()
     {
-        parent::__construct();
         $this->components = new ArrayList();
+        $this->constructExtensions();
     }
 
     /**

src/Forms/GridField/GridFieldDetailForm.php

@@ -3,16 +3,17 @@
 namespace SilverStripe\Forms\GridField;
 
 use SilverStripe\Control\HTTPRequest;
+use SilverStripe\Control\HTTPResponse;
 use SilverStripe\Control\RequestHandler;
 use SilverStripe\Core\Extensible;
 use SilverStripe\ORM\DataModel;
 use SilverStripe\ORM\DataObject;
-use SilverStripe\Core\Object;
 use SilverStripe\Core\ClassInfo;
 use SilverStripe\Core\Injector\Injector;
 use SilverStripe\Forms\Validator;
 use SilverStripe\Forms\FieldList;
 use Closure;
+use SilverStripe\ORM\Filterable;
 
 /**
  * Provides view and edit forms at GridField-specific URLs.
@@ -91,7 +92,7 @@ class GridFieldDetailForm implements GridField_URLHandler
      *
      * @param GridField $gridField
      * @param HTTPRequest $request
-     * @return GridFieldDetailForm_ItemRequest
+     * @return HTTPResponse
      */
     public function handleItem($gridField, $request)
     {
@@ -102,21 +103,18 @@ class GridFieldDetailForm implements GridField_URLHandler
 
         /** @var DataObject $record */
         if (is_numeric($request->param('ID'))) {
-            $record = $gridField->getList()->byID($request->param("ID"));
+            /** @var Filterable $dataList */
+            $dataList = $gridField->getList();
+            $record = $dataList->byID($request->param("ID"));
         } else {
-            $record = Object::create($gridField->getModelClass());
+            $record = Injector::inst()->create($gridField->getModelClass());
         }
 
         $handler = $this->getItemRequestHandler($gridField, $record, $requestHandler);
 
         // if no validator has been set on the GridField and the record has a
         // CMS validator, use that.
-        if (!$this->getValidator()
+        if (!$this->getValidator() && ClassInfo::hasMethod($record, 'getCMSValidator')) {
-            && (
-                method_exists($record, 'getCMSValidator')
-                || $record instanceof Object && $record->hasMethod('getCMSValidator')
-            )
-        ) {
             $this->setValidator($record->getCMSValidator());
         }
 
@@ -236,8 +234,8 @@ class GridFieldDetailForm implements GridField_URLHandler
     {
         if ($this->itemRequestClass) {
             return $this->itemRequestClass;
-        } elseif (ClassInfo::exists(get_class($this) . "_ItemRequest")) {
+        } elseif (ClassInfo::exists(static::class . "_ItemRequest")) {
-            return get_class($this) . "_ItemRequest";
+            return static::class . "_ItemRequest";
         } else {
             return __CLASS__ . '_ItemRequest';
         }

src/Forms/GridField/GridFieldFilterHeader.php

@@ -65,7 +65,7 @@ class GridFieldFilterHeader implements GridField_HTMLProvider, GridField_DataMan
         } else {
             if ($this->throwExceptionOnBadDataType) {
                 throw new LogicException(
-                    get_class($this) . " expects an SS_Filterable list to be passed to the GridField."
+                    static::class . " expects an SS_Filterable list to be passed to the GridField."
                 );
             }
             return false;

src/Forms/GridField/GridFieldLevelup.php

@@ -2,10 +2,11 @@
 
 namespace SilverStripe\Forms\GridField;
 
-use SilverStripe\Core\Object;
+use SilverStripe\Core\Injector\Injectable;
 use SilverStripe\Forms\FormField;
 use SilverStripe\ORM\DataObject;
 use SilverStripe\ORM\FieldType\DBField;
+use SilverStripe\ORM\Hierarchy\Hierarchy;
 use SilverStripe\View\ArrayData;
 use SilverStripe\View\SSViewer;
 
@@ -14,8 +15,9 @@ use SilverStripe\View\SSViewer;
  * hierarchical data. Requires the managed record to have a "getParent()"
  * method or has_one relationship called "Parent".
  */
-class GridFieldLevelup extends Object implements GridField_HTMLProvider
+class GridFieldLevelup implements GridField_HTMLProvider
 {
+    use Injectable;
 
     /**
      * @var integer - the record id of the level up to
@@ -40,12 +42,15 @@ class GridFieldLevelup extends Object implements GridField_HTMLProvider
      */
     public function __construct($currentID)
     {
-        parent::__construct();
         if ($currentID && is_numeric($currentID)) {
             $this->currentID = $currentID;
         }
     }
 
+    /**
+     * @param GridField $gridField
+     * @return array|null
+     */
     public function getHTMLFragments($gridField)
     {
         $modelClass = $gridField->getModelClass();
@@ -55,6 +60,7 @@ class GridFieldLevelup extends Object implements GridField_HTMLProvider
             return null;
         }
 
+        /** @var DataObject|Hierarchy $modelObj */
         $modelObj = DataObject::get_by_id($modelClass, $this->currentID);
 
         $parent = null;

src/Forms/GridField/GridFieldPageCount.php

@@ -51,7 +51,7 @@ class GridFieldPageCount implements GridField_HTMLProvider
 
         if (!$paginator && GridFieldPageCount::config()->uninherited('require_paginator')) {
             throw new LogicException(
-                get_class($this) . " relies on a GridFieldPaginator to be added " .
+                static::class . " relies on a GridFieldPaginator to be added " .
                 "to the same GridField, but none are present."
             );
         }

src/Forms/GridField/GridFieldPaginator.php

@@ -88,7 +88,7 @@ class GridFieldPaginator implements GridField_HTMLProvider, GridField_DataManipu
         } else {
             if ($this->throwExceptionOnBadDataType) {
                 throw new LogicException(
-                    get_class($this) . " expects an SS_Limitable list to be passed to the GridField."
+                    static::class . " expects an SS_Limitable list to be passed to the GridField."
                 );
             }
             return false;

src/Forms/GridField/GridFieldSortableHeader.php

@@ -75,7 +75,7 @@ class GridFieldSortableHeader implements GridField_HTMLProvider, GridField_DataM
         } else {
             if ($this->throwExceptionOnBadDataType) {
                 throw new LogicException(
-                    get_class($this) . " expects an SS_Sortable list to be passed to the GridField."
+                    static::class . " expects an SS_Sortable list to be passed to the GridField."
                 );
             }
             return false;

src/Forms/HTMLEditor/HTMLEditorField_Toolbar.php

@@ -47,7 +47,7 @@ class HTMLEditorField_Toolbar extends RequestHandler
      */
     public function getTemplateViewFile()
     {
-        return SSViewer::get_templates_by_class(get_class($this), '_viewfile', __CLASS__);
+        return SSViewer::get_templates_by_class(static::class, '_viewfile', __CLASS__);
     }
 
     /**

src/Forms/NullableField.php

@@ -170,7 +170,7 @@ class NullableField extends FormField
     {
         $result = sprintf(
             '%s (%s: $s : <span style="color: red">%s</span>) = ',
-            $this->class,
+            static::class,
             $this->name,
             $this->title,
             $this->message

src/Forms/Validator.php

@@ -2,7 +2,9 @@
 
 namespace SilverStripe\Forms;
 
-use SilverStripe\Core\Object;
+use SilverStripe\Core\Config\Configurable;
+use SilverStripe\Core\Extensible;
+use SilverStripe\Core\Injector\Injectable;
 use SilverStripe\ORM\ValidationResult;
 
 /**
@@ -10,13 +12,16 @@ use SilverStripe\ORM\ValidationResult;
  * fields. It relies on javascript for client-side validation, and marking fields after server-side
  * validation. It acts as a visitor to individual form fields.
  */
-abstract class Validator extends Object
+abstract class Validator
 {
+    use Injectable;
+    use Configurable;
+    use Extensible;
 
     public function __construct()
     {
-        parent::__construct();
         $this->resetResult();
+        $this->constructExtensions();
     }
 
     /**

src/ORM/ArrayList.php

@@ -118,7 +118,7 @@ class ArrayList extends ViewableData implements SS_List, Filterable, Sortable, L
 
     public function debug()
     {
-        $val = "<h2>" . $this->class . "</h2><ul>";
+        $val = "<h2>" . static::class . "</h2><ul>";
         foreach ($this->toNestedArray() as $item) {
             $val .= "<li style=\"list-style-type: disc; margin-left: 20px\">" . Debug::text($item) . "</li>";
         }

src/ORM/Connect/DBConnector.php

@@ -73,8 +73,8 @@ abstract class DBConnector
     public function isQueryMutable($sql)
     {
         $operations = array_merge(
-            Config::inst()->get(get_class($this), 'write_operations'),
+            Config::inst()->get(static::class, 'write_operations'),
-            Config::inst()->get(get_class($this), 'ddl_operations')
+            Config::inst()->get(static::class, 'ddl_operations')
         );
         return $this->isQueryType($sql, $operations);
     }
@@ -87,7 +87,7 @@ abstract class DBConnector
      */
     public function isQueryDDL($sql)
     {
-        $operations = Config::inst()->get(get_class($this), 'ddl_operations');
+        $operations = Config::inst()->get(static::class, 'ddl_operations');
         return $this->isQueryType($sql, $operations);
     }
 
@@ -100,7 +100,7 @@ abstract class DBConnector
      */
     public function isQueryWrite($sql)
     {
-        $operations = Config::inst()->get(get_class($this), 'write_operations');
+        $operations = Config::inst()->get(static::class, 'write_operations');
         return $this->isQueryType($sql, $operations);
     }
 

src/ORM/Connect/DBSchemaManager.php

@@ -4,7 +4,7 @@ namespace SilverStripe\ORM\Connect;
 
 use SilverStripe\Control\Director;
 use SilverStripe\Core\Config\Config;
-use SilverStripe\Core\Object;
+use SilverStripe\Core\Injector\Injector;
 use SilverStripe\ORM\FieldType\DBPrimaryKey;
 use SilverStripe\ORM\FieldType\DBField;
 use Exception;
@@ -389,7 +389,7 @@ abstract class DBSchemaManager
                 }
 
                 /** @var DBField $fieldObj */
-                $fieldObj = Object::create_from_string($fieldSpec, $fieldName);
+                $fieldObj = Injector::inst()->create($fieldSpec, $fieldName);
                 $fieldObj->setArrayValue($arrayValue);
 
                 $fieldObj->setTable($table);

src/ORM/Connect/Database.php

@@ -777,7 +777,7 @@ abstract class Database
     public function selectDatabase($name, $create = false, $errorLevel = E_USER_ERROR)
     {
         // In case our live environment is locked down, we can bypass a SHOW DATABASE check
-        $canConnect = Config::inst()->get(get_class($this), 'optimistic_connect')
+        $canConnect = Config::inst()->get(static::class, 'optimistic_connect')
             || $this->schemaManager->databaseExists($name);
         if ($canConnect) {
             return $this->connector->selectDatabase($name);

src/ORM/DataExtension.php

@@ -165,7 +165,7 @@ abstract class DataExtension extends Extension
      */
     public function updateSummaryFields(&$fields)
     {
-        $summary_fields = Config::inst()->get($this->class, 'summary_fields');
+        $summary_fields = Config::inst()->get(static::class, 'summary_fields');
         if ($summary_fields) {
             // if summary_fields were passed in numeric array,
             // convert to an associative array
@@ -188,7 +188,7 @@ abstract class DataExtension extends Extension
      */
     public function updateFieldLabels(&$labels)
     {
-        $field_labels = Config::inst()->get($this->class, 'field_labels');
+        $field_labels = Config::inst()->get(static::class, 'field_labels');
         if ($field_labels) {
             $labels = array_merge($labels, $field_labels);
         }

src/ORM/DataList.php

@@ -750,8 +750,7 @@ class DataList extends ViewableData implements SS_List, Filterable, Sortable, Li
 
     public function debug()
     {
-        $val = "<h2>" . $this->class . "</h2><ul>";
+        $val = "<h2>" . static::class . "</h2><ul>";
-
         foreach ($this->toNestedArray() as $item) {
             $val .= "<li style=\"list-style-type: disc; margin-left: 20px\">" . Debug::text($item) . "</li>";
         }
@@ -1072,7 +1071,7 @@ class DataList extends ViewableData implements SS_List, Filterable, Sortable, Li
     /**
      * Remove every element in this DataList matching the given $filter.
      *
-     * @param string $filter - a sql type where filter
+     * @param string|array $filter - a sql type where filter
      * @return $this
      */
     public function removeByFilter($filter)

src/ORM/DataObject.php

@@ -4,7 +4,6 @@ namespace SilverStripe\ORM;
 
 use SilverStripe\Core\ClassInfo;
 use SilverStripe\Core\Config\Config;
-use SilverStripe\Core\Object;
 use SilverStripe\Core\Injector\Injector;
 use SilverStripe\Core\Resettable;
 use SilverStripe\Dev\Deprecation;
@@ -30,6 +29,7 @@ use LogicException;
 use InvalidArgumentException;
 use BadMethodCallException;
 use Exception;
+use stdClass;
 
 /**
  * A single database record & abstract class for the data-access-model.
@@ -306,7 +306,11 @@ class DataObject extends ViewableData implements DataObjectInterface, i18nEntity
             );
         }
 
-        if (!is_array($record) && !is_a($record, "stdClass")) {
+        if ($record instanceof stdClass) {
+            $record = (array)$record;
+        }
+
+        if (!is_array($record)) {
             if (is_object($record)) {
                 $passed = "an object of type '".get_class($record)."'";
             } else {
@@ -321,10 +325,6 @@ class DataObject extends ViewableData implements DataObjectInterface, i18nEntity
             $record = null;
         }
 
-        if (is_a($record, "stdClass")) {
-            $record = (array)$record;
-        }
-
         // Set $this->record to $record, but ignore NULLs
         $this->record = array();
         foreach ($record as $k => $v) {
@@ -517,7 +517,6 @@ class DataObject extends ViewableData implements DataObjectInterface, i18nEntity
             return $this;
         }
 
-        $this->class = $className;
         $this->setField("ClassName", $className);
         $this->setField('RecordClassName', $className);
         return $this;
@@ -568,20 +567,6 @@ class DataObject extends ViewableData implements DataObjectInterface, i18nEntity
     {
         parent::defineMethods();
 
-        // Define the extra db fields - this is only necessary for extensions added in the
-        // class definition.  Object::add_extension() will call this at definition time for
-        // those objects, which is a better mechanism.  Perhaps extensions defined inside the
-        // class def can somehow be applied at definiton time also?
-        if ($this->extension_instances) {
-            foreach ($this->extension_instances as $i => $instance) {
-                if (!$instance->class) {
-                    $class = get_class($instance);
-                    user_error("DataObject::defineMethods(): Please ensure {$class}::__construct() calls"
-                    . " parent::__construct()", E_USER_ERROR);
-                }
-            }
-        }
-
         if (static::class === self::class) {
              return;
         }
@@ -815,11 +800,12 @@ class DataObject extends ViewableData implements DataObjectInterface, i18nEntity
      */
     public function update($data)
     {
-        foreach ($data as $k => $v) {
+        foreach ($data as $key => $value) {
             // Implement dot syntax for updates
-            if (strpos($k, '.') !== false) {
+            if (strpos($key, '.') !== false) {
-                $relations = explode('.', $k);
+                $relations = explode('.', $key);
                 $fieldName = array_pop($relations);
+                /** @var static $relObj */
                 $relObj = $this;
                 $relation = null;
                 foreach ($relations as $i => $relation) {
@@ -829,7 +815,7 @@ class DataObject extends ViewableData implements DataObjectInterface, i18nEntity
                         $parentObj = $relObj;
                         $relObj = $relObj->$relation();
                         // If the intermediate relationship objects have been created, then write them
-                        if ($i<sizeof($relation)-1 && !$relObj->ID || (!$relObj->ID && $parentObj != $this)) {
+                        if ($i<sizeof($relation)-1 && !$relObj->ID || (!$relObj->ID && $parentObj !== $this)) {
                             $relObj->write();
                             $relatedFieldName = $relation."ID";
                             $parentObj->$relatedFieldName = $relObj->ID;
@@ -848,16 +834,17 @@ class DataObject extends ViewableData implements DataObjectInterface, i18nEntity
                 }
 
                 if ($relObj) {
-                    $relObj->$fieldName = $v;
+                    $relObj->$fieldName = $value;
                     $relObj->write();
                     $relatedFieldName = $relation."ID";
                     $this->$relatedFieldName = $relObj->ID;
                     $relObj->flushCache();
                 } else {
-                    user_error("Couldn't follow dot syntax '$k' on '$this->class' object", E_USER_WARNING);
+                    $class = static::class;
+                    user_error("Couldn't follow dot syntax '{$key}' on '{$class}' object", E_USER_WARNING);
                 }
             } else {
-                $this->$k = $v;
+                $this->$key = $value;
             }
         }
         return $this;
@@ -949,6 +936,7 @@ class DataObject extends ViewableData implements DataObjectInterface, i18nEntity
         if ($includeRelations) {
             if ($manyMany = $this->manyMany()) {
                 foreach ($manyMany as $relationship => $class) {
+                    /** @var DataObject $leftComponents */
                     $leftComponents = $leftObj->getManyManyComponents($relationship);
                     $rightComponents = $rightObj->getManyManyComponents($relationship);
                     if ($rightComponents && $rightComponents->exists()) {
@@ -1110,7 +1098,7 @@ class DataObject extends ViewableData implements DataObjectInterface, i18nEntity
 
             if ($defaults && !is_array($defaults)) {
                 user_error(
-                    "Bad '$this->class' defaults given: " . var_export($defaults, true),
+                    "Bad '" . static::class . "' defaults given: " . var_export($defaults, true),
                     E_USER_WARNING
                 );
                 $defaults = null;
@@ -1181,7 +1169,7 @@ class DataObject extends ViewableData implements DataObjectInterface, i18nEntity
         $this->brokenOnWrite = true;
         $this->onBeforeWrite();
         if ($this->brokenOnWrite) {
-            user_error("$this->class has a broken onBeforeWrite() function."
+            user_error(static::class . " has a broken onBeforeWrite() function."
                 . " Make sure that you call parent::onBeforeWrite().", E_USER_ERROR);
         }
     }
@@ -1251,7 +1239,7 @@ class DataObject extends ViewableData implements DataObjectInterface, i18nEntity
                     = empty($this->record['Created'])
                         ? $now
                         : $this->record['Created'];
-                $manipulation[$table]['fields']['ClassName'] = $this->class;
+                $manipulation[$table]['fields']['ClassName'] = static::class;
             }
         }
 
@@ -1434,7 +1422,7 @@ class DataObject extends ViewableData implements DataObjectInterface, i18nEntity
         $this->brokenOnDelete = true;
         $this->onBeforeDelete();
         if ($this->brokenOnDelete) {
-            user_error("$this->class has a broken onBeforeDelete() function."
+            user_error(static::class . " has a broken onBeforeDelete() function."
                 . " Make sure that you call parent::onBeforeDelete().", E_USER_ERROR);
         }
 
@@ -1447,7 +1435,10 @@ class DataObject extends ViewableData implements DataObjectInterface, i18nEntity
         //  - move the details of the delete code in the DataQuery system
         //  - update the code to just delete the base table, and rely on cascading deletes in the DB to do the rest
         //    obviously, that means getting requireTable() to configure cascading deletes ;-)
-        $srcQuery = DataList::create($this->class, $this->model)->where("ID = $this->ID")->dataQuery()->query();
+        $srcQuery = DataList::create(static::class, $this->model)
+            ->filter('ID', $this->ID)
+            ->dataQuery()
+            ->query();
         foreach ($srcQuery->queriedTables() as $table) {
             $delete = new SQLDelete("\"$table\"", array('"ID"' => $this->ID));
             $delete->execute();
@@ -1538,7 +1529,7 @@ class DataObject extends ViewableData implements DataObjectInterface, i18nEntity
                 if ($polymorphic) {
                     $filter = array(
                         "{$joinField}ID" => $joinID,
-                        "{$joinField}Class" => $this->class
+                        "{$joinField}Class" => static::class,
                     );
                 } else {
                     $filter = array(
@@ -1557,7 +1548,7 @@ class DataObject extends ViewableData implements DataObjectInterface, i18nEntity
                 $component = $this->model->$class->newObject();
                 if ($polymorphic) {
                     $component->{$joinField.'ID'} = $this->ID;
-                    $component->{$joinField.'Class'} = $this->class;
+                    $component->{$joinField.'Class'} = static::class;
                 } else {
                     $component->$joinField = $this->ID;
                 }
@@ -1588,7 +1579,7 @@ class DataObject extends ViewableData implements DataObjectInterface, i18nEntity
             throw new InvalidArgumentException(sprintf(
                 "DataObject::getComponents(): Unknown 1-to-many component '%s' on class '%s'",
                 $componentName,
-                $this->class
+                static::class
             ));
         }
 
@@ -1596,7 +1587,7 @@ class DataObject extends ViewableData implements DataObjectInterface, i18nEntity
         if (!$this->ID) {
             if (!isset($this->unsavedRelations[$componentName])) {
                 $this->unsavedRelations[$componentName] =
-                    new UnsavedRelationList($this->class, $componentName, $componentClass);
+                    new UnsavedRelationList(static::class, $componentName, $componentClass);
             }
             return $this->unsavedRelations[$componentName];
         }
@@ -1605,7 +1596,7 @@ class DataObject extends ViewableData implements DataObjectInterface, i18nEntity
         $joinField = $schema->getRemoteJoinField(static::class, $componentName, 'has_many', $polymorphic);
         /** @var HasManyList $result */
         if ($polymorphic) {
-            $result = PolymorphicHasManyList::create($componentClass, $joinField, $this->class);
+            $result = PolymorphicHasManyList::create($componentClass, $joinField, get_class($this));
         } else {
             $result = HasManyList::create($componentClass, $joinField);
         }
@@ -1630,11 +1621,7 @@ class DataObject extends ViewableData implements DataObjectInterface, i18nEntity
         // Parse many_many
         $manyManyComponent = $this->getSchema()->manyManyComponent(static::class, $relationName);
         if ($manyManyComponent) {
-            list(
+            return $manyManyComponent['childClass'];
-                $relationClass, $parentClass, $componentClass,
-                $parentField, $childField, $tableOrClass
-            ) = $manyManyComponent;
-            return $componentClass;
         }
 
         // Go through all relationship configuration fields.
@@ -1772,18 +1759,17 @@ class DataObject extends ViewableData implements DataObjectInterface, i18nEntity
             case 'many_many':
             case 'belongs_many_many': {
                 // Get components and extra fields from parent
-                list($relationClass, $componentClass, $parentClass, $componentField, $parentField, $table)
+                $manyMany = $remote->getSchema()->manyManyComponent($remoteClass, $remoteRelation);
-                    = $remote->getSchema()->manyManyComponent($remoteClass, $remoteRelation);
                 $extraFields = $schema->manyManyExtraFieldsForComponent($remoteClass, $remoteRelation) ?: array();
 
                 // Reverse parent and component fields and create an inverse ManyManyList
                 /** @var RelationList $result */
                 $result = Injector::inst()->create(
-                    $relationClass,
+                    $manyMany['relationClass'],
-                    $componentClass,
+                    $manyMany['parentClass'], // Substitute parent class for dataClass
-                    $table,
+                    $manyMany['join'],
-                    $componentField,
+                    $manyMany['parentField'], // Reversed parent / child field
-                    $parentField,
+                    $manyMany['childField'], // Reversed parent / child field
                     $extraFields
                 );
                 if ($this->model) {
@@ -1816,18 +1802,15 @@ class DataObject extends ViewableData implements DataObjectInterface, i18nEntity
             throw new InvalidArgumentException(sprintf(
                 "DataObject::getComponents(): Unknown many-to-many component '%s' on class '%s'",
                 $componentName,
-                $this->class
+                static::class
             ));
         }
 
-        list($relationClass, $parentClass, $componentClass, $parentField, $componentField, $tableOrClass)
-            = $manyManyComponent;
-
         // If we haven't been written yet, we can't save these relations, so use a list that handles this case
         if (!$this->ID) {
             if (!isset($this->unsavedRelations[$componentName])) {
                 $this->unsavedRelations[$componentName] =
-                    new UnsavedRelationList($parentClass, $componentName, $componentClass);
+                    new UnsavedRelationList($manyManyComponent['parentClass'], $componentName, $manyManyComponent['childClass']);
             }
             return $this->unsavedRelations[$componentName];
         }
@@ -1835,11 +1818,11 @@ class DataObject extends ViewableData implements DataObjectInterface, i18nEntity
         $extraFields = $schema->manyManyExtraFieldsForComponent(static::class, $componentName) ?: array();
         /** @var RelationList $result */
         $result = Injector::inst()->create(
-            $relationClass,
+            $manyManyComponent['relationClass'],
-            $componentClass,
+            $manyManyComponent['childClass'],
-            $tableOrClass,
+            $manyManyComponent['join'],
-            $componentField,
+            $manyManyComponent['childField'],
-            $parentField,
+            $manyManyComponent['parentField'],
             $extraFields
         );
 
@@ -1968,7 +1951,7 @@ class DataObject extends ViewableData implements DataObjectInterface, i18nEntity
     public function getDefaultSearchContext()
     {
         return new SearchContext(
-            $this->class,
+            static::class,
             $this->scaffoldSearchFields(),
             $this->defaultSearchFilters()
         );
@@ -2069,7 +2052,7 @@ class DataObject extends ViewableData implements DataObjectInterface, i18nEntity
             (array)$_params
         );
 
-        $fs = new FormScaffolder($this);
+        $fs = FormScaffolder::create($this);
         $fs->tabbed = $params['tabbed'];
         $fs->includeRelations = $params['includeRelations'];
         $fs->restrictFields = $params['restrictFields'];
@@ -2634,7 +2617,8 @@ class DataObject extends ViewableData implements DataObjectInterface, i18nEntity
      */
     public function debug()
     {
-        $val = "<h3>Database record: $this->class</h3>\n<ul>\n";
+        $class = static::class;
+        $val = "<h3>Database record: {$class}</h3>\n<ul>\n";
         if ($this->record) {
             foreach ($this->record as $fieldName => $fieldVal) {
                 $val .= "\t<li>$fieldName: " . Debug::text($fieldVal) . "</li>\n";
@@ -2680,7 +2664,7 @@ class DataObject extends ViewableData implements DataObjectInterface, i18nEntity
         list($class, $spec) = explode('.', $helper);
         /** @var DBField $obj */
         $table = $schema->tableName($class);
-        $obj = Object::create_from_string($spec, $fieldName);
+        $obj = Injector::inst()->create($spec, $fieldName);
         $obj->setTable($table);
         $obj->setValue($value, $this, false);
         return $obj;
@@ -2712,6 +2696,7 @@ class DataObject extends ViewableData implements DataObjectInterface, i18nEntity
                     if (method_exists($component, $relation)) {
                         $component = $component->$relation();
                     } else {
+                        /** @var DataList $component */
                         $component = $component->relation($relation);
                     }
                 } else {
@@ -2749,6 +2734,7 @@ class DataObject extends ViewableData implements DataObjectInterface, i18nEntity
                     $component = $component->$relation();
                 } elseif ($component instanceof SS_List) {
                     // Select adjacent relation from DataList
+                    /** @var DataList $component */
                     $component = $component->relation($relation);
                 } elseif ($component instanceof DataObject
                     && ($dbObject = $component->dbObject($relation))
@@ -2914,12 +2900,12 @@ class DataObject extends ViewableData implements DataObjectInterface, i18nEntity
      */
     public function flushCache($persistent = true)
     {
-        if ($this->class == self::class) {
+        if (static::class == self::class) {
             self::$_cache_get_one = array();
             return $this;
         }
 
-        $classes = ClassInfo::ancestry($this->class);
+        $classes = ClassInfo::ancestry(static::class);
         foreach ($classes as $class) {
             if (isset(self::$_cache_get_one[$class])) {
                 unset(self::$_cache_get_one[$class]);
@@ -3139,10 +3125,9 @@ class DataObject extends ViewableData implements DataObjectInterface, i18nEntity
             foreach ($manyMany as $component => $spec) {
                 // Get many_many spec
                 $manyManyComponent = $schema->manyManyComponent(static::class, $component);
-                list(
+                $parentField = $manyManyComponent['parentField'];
-                    $relationClass, $parentClass, $componentClass,
+                $childField = $manyManyComponent['childField'];
-                    $parentField, $childField, $tableOrClass
+                $tableOrClass = $manyManyComponent['join'];
-                ) = $manyManyComponent;
 
                 // Skip if backed by actual class
                 if (class_exists($tableOrClass)) {
@@ -3184,9 +3169,9 @@ class DataObject extends ViewableData implements DataObjectInterface, i18nEntity
         $defaultRecords = $this->config()->uninherited('default_records');
 
         if (!empty($defaultRecords)) {
-            $hasData = DataObject::get_one($this->class);
+            $hasData = DataObject::get_one(static::class);
             if (!$hasData) {
-                $className = $this->class;
+                $className = static::class;
                 foreach ($defaultRecords as $record) {
                     $obj = $this->model->$className->newObject($record);
                     $obj->write();
@@ -3308,14 +3293,14 @@ class DataObject extends ViewableData implements DataObjectInterface, i18nEntity
      */
     public function fieldLabels($includerelations = true)
     {
-        $cacheKey = $this->class . '_' . $includerelations;
+        $cacheKey = static::class . '_' . $includerelations;
 
         if (!isset(self::$_cache_field_labels[$cacheKey])) {
             $customLabels = $this->stat('field_labels');
             $autoLabels = array();
 
             // get all translated static properties as defined in i18nCollectStatics()
-            $ancestry = ClassInfo::ancestry($this->class);
+            $ancestry = ClassInfo::ancestry(static::class);
             $ancestry = array_reverse($ancestry);
             if ($ancestry) {
                 foreach ($ancestry as $ancestorClass) {

src/ORM/DataObjectSchema.php

@@ -5,10 +5,10 @@ namespace SilverStripe\ORM;
 use Exception;
 use SilverStripe\Core\Injector\Injectable;
 use SilverStripe\Core\Config\Configurable;
+use SilverStripe\Core\Injector\Injector;
 use SilverStripe\ORM\FieldType\DBComposite;
 use SilverStripe\Core\ClassInfo;
 use SilverStripe\Core\Config\Config;
-use SilverStripe\Core\Object;
 use InvalidArgumentException;
 use LogicException;
 
@@ -438,7 +438,7 @@ class DataObjectSchema
 
         // Merge composite fields into DB
         foreach ($compositeFields as $fieldName => $fieldSpec) {
-            $fieldObj = Object::create_from_string($fieldSpec, $fieldName);
+            $fieldObj = Injector::inst()->create($fieldSpec, $fieldName);
             $fieldObj->setTable($class);
             $nestedFields = $fieldObj->compositeDatabaseFields();
             foreach ($nestedFields as $nestedName => $nestedSpec) {
@@ -498,7 +498,7 @@ class DataObjectSchema
         }
 
         // Find regular field
-        while ($candidateClass) {
+        while ($candidateClass && $candidateClass !== DataObject::class) {
             $fields = $this->databaseFields($candidateClass, false);
             if (isset($fields[$fieldName])) {
                 return $candidateClass;
@@ -533,9 +533,9 @@ class DataObjectSchema
         $classes = ClassInfo::ancestry($class);
         foreach ($classes as $parentClass) {
             // Check if the component is defined in many_many on this class
-            $manyMany = Config::inst()->get($parentClass, 'many_many', Config::UNINHERITED);
+            $otherManyMany = Config::inst()->get($parentClass, 'many_many', Config::UNINHERITED);
-            if (isset($manyMany[$component])) {
+            if (isset($otherManyMany[$component])) {
-                return $this->parseManyManyComponent($parentClass, $component, $manyMany[$component]);
+                return $this->parseManyManyComponent($parentClass, $component, $otherManyMany[$component]);
             }
 
             // Check if the component is defined in belongs_many_many on this class
@@ -545,13 +545,22 @@ class DataObjectSchema
             }
 
             // Extract class and relation name from dot-notation
-            list($childClass, $relationName)
+            $belongs = $this->parseBelongsManyManyComponent(
-                = $this->parseBelongsManyManyComponent($parentClass, $component, $belongsManyMany[$component]);
+                $parentClass,
+                $component,
+                $belongsManyMany[$component]
+            );
 
             // Build inverse relationship from other many_many, and swap parent/child
-            list($relationClass, $childClass, $parentClass, $childField, $parentField, $joinTable)
+            $otherManyMany = $this->manyManyComponent($belongs['childClass'], $belongs['relationName']);
-                = $this->manyManyComponent($childClass, $relationName);
+            return [
-            return [$relationClass, $parentClass, $childClass, $parentField, $childField, $joinTable];
+                'relationClass' => $otherManyMany['relationClass'],
+                'parentClass' => $otherManyMany['childClass'],
+                'childClass' => $otherManyMany['parentClass'],
+                'parentField' => $otherManyMany['childField'],
+                'childField' => $otherManyMany['parentField'],
+                'join' => $otherManyMany['join'],
+            ];
         }
         return null;
     }
@@ -596,7 +605,10 @@ class DataObjectSchema
         }
 
         // Return relatios
-        return array($childClass, $relationName);
+        return [
+            'childClass' => $childClass,
+            'relationName' => $relationName
+        ];
     }
 
     /**
@@ -619,12 +631,12 @@ class DataObjectSchema
             $belongsManyMany = Config::inst()->get($class, 'belongs_many_many', Config::UNINHERITED);
             if (isset($belongsManyMany[$component])) {
                 // Reverse relationship and find extrafields from child class
-                list($childClass, $relationName) = $this->parseBelongsManyManyComponent(
+                $belongs = $this->parseBelongsManyManyComponent(
                     $class,
                     $component,
                     $belongsManyMany[$component]
                 );
-                return $this->manyManyExtraFieldsForComponent($childClass, $relationName);
+                return $this->manyManyExtraFieldsForComponent($belongs['childClass'], $belongs['relationName']);
             }
             $class = get_parent_class($class);
         }
@@ -717,12 +729,12 @@ class DataObjectSchema
             $parentClass = $this->checkManyManyFieldClass($parentClass, $component, $joinClass, $specification, 'from');
             $joinChildClass = $this->checkManyManyFieldClass($parentClass, $component, $joinClass, $specification, 'to');
             return [
-                ManyManyThroughList::class,
+                'relationClass' => ManyManyThroughList::class,
-                $parentClass,
+                'parentClass' => $parentClass,
-                $joinChildClass,
+                'childClass' => $joinChildClass,
-                $specification['from'] . 'ID',
+                'parentField' => $specification['from'] . 'ID',
-                $specification['to'] . 'ID',
+                'childField' => $specification['to'] . 'ID',
-                $joinClass,
+                'join' => $joinClass,
             ];
         }
 
@@ -740,12 +752,12 @@ class DataObjectSchema
         }
         $joinTable = "{$classTable}_{$component}";
         return [
-            ManyManyList::class,
+            'relationClass' => ManyManyList::class,
-            $parentClass,
+            'parentClass' => $parentClass,
-            $specification,
+            'childClass' => $specification,
-            $parentField,
+            'parentField' => $parentField,
-            $childField,
+            'childField' => $childField,
-            $joinTable,
+            'join' => $joinTable,
         ];
     }
 

src/ORM/DataQuery.php

@@ -4,7 +4,6 @@ namespace SilverStripe\ORM;
 
 use SilverStripe\Core\ClassInfo;
 use SilverStripe\Core\Convert;
-use SilverStripe\Core\Object;
 use SilverStripe\Core\Injector\Injector;
 use SilverStripe\ORM\Connect\Query;
 use SilverStripe\ORM\Queries\SQLConditionGroup;
@@ -452,8 +451,8 @@ class DataQuery
      */
     public function max($field)
     {
-        $table = ClassInfo::table_for_object_field($this->dataClass, $field);
+        $table = DataObject::getSchema()->tableForField($this->dataClass, $field);
-        if (!$table || $table === 'DataObject') {
+        if (!$table) {
             return $this->aggregate("MAX(\"$field\")");
         }
         return $this->aggregate("MAX(\"$table\".\"$field\")");
@@ -468,8 +467,8 @@ class DataQuery
      */
     public function min($field)
     {
-        $table = ClassInfo::table_for_object_field($this->dataClass, $field);
+        $table = DataObject::getSchema()->tableForField($this->dataClass, $field);
-        if (!$table || $table === 'DataObject') {
+        if (!$table) {
             return $this->aggregate("MIN(\"$field\")");
         }
         return $this->aggregate("MIN(\"$table\".\"$field\")");
@@ -484,8 +483,8 @@ class DataQuery
      */
     public function avg($field)
     {
-        $table = ClassInfo::table_for_object_field($this->dataClass, $field);
+        $table = DataObject::getSchema()->tableForField($this->dataClass, $field);
-        if (!$table || $table === 'DataObject') {
+        if (!$table) {
             return $this->aggregate("AVG(\"$field\")");
         }
         return $this->aggregate("AVG(\"$table\".\"$field\")");
@@ -500,8 +499,8 @@ class DataQuery
      */
     public function sum($field)
     {
-        $table = ClassInfo::table_for_object_field($this->dataClass, $field);
+        $table = DataObject::getSchema()->tableForField($this->dataClass, $field);
-        if (!$table || $table === 'DataObject') {
+        if (!$table) {
             return $this->aggregate("SUM(\"$field\")");
         }
         return $this->aggregate("SUM(\"$table\".\"$field\")");
@@ -569,7 +568,7 @@ class DataQuery
         foreach ($compositeFields as $k => $v) {
             if ((is_null($columns) || in_array($k, $columns)) && $v) {
                 $tableName = $schema->tableName($tableClass);
-                $dbO = Object::create_from_string($v, $k);
+                $dbO = Injector::inst()->create($v, $k);
                 $dbO->setTable($tableName);
                 $dbO->addToQuery($query);
             }
@@ -799,18 +798,15 @@ class DataQuery
                 if ($linearOnly) {
                     throw new InvalidArgumentException("$rel is not a linear relation on model $modelClass");
                 }
-                // Join via many_many
-                list($relationClass, $parentClass, $componentClass, $parentField, $componentField, $relationTable)
-                    = $component;
                 $this->joinManyManyRelationship(
-                    $relationClass,
+                    $component['relationClass'],
-                    $parentClass,
+                    $component['parentClass'],
-                    $componentClass,
+                    $component['childClass'],
-                    $parentField,
+                    $component['parentField'],
-                    $componentField,
+                    $component['childField'],
-                    $relationTable
+                    $component['join']
                 );
-                $modelClass = $componentClass;
+                $modelClass = $component['childClass'];
             } else {
                 throw new InvalidArgumentException("$rel is not a relation on model $modelClass");
             }
@@ -1073,7 +1069,7 @@ class DataQuery
      * It's expected that the $key will be namespaced, e.g, 'Versioned.stage' instead of just 'stage'.
      *
      * @param string $key
-     * @param string $value
+     * @param string|array $value
      * @return $this
      */
     public function setQueryParam($key, $value)

src/ORM/FieldType/DBBoolean.php

@@ -49,7 +49,8 @@ class DBBoolean extends DBField
         if ($fieldName) {
             $dataObject->$fieldName = ($this->value) ? 1 : 0;
         } else {
-            user_error("DBField::saveInto() Called on a nameless '$this->class' object", E_USER_ERROR);
+            $class = static::class;
+            user_error("DBField::saveInto() Called on a nameless '$class' object", E_USER_ERROR);
         }
     }
 

src/ORM/FieldType/DBComposite.php

@@ -2,7 +2,7 @@
 
 namespace SilverStripe\ORM\FieldType;
 
-use SilverStripe\Core\Object;
+use SilverStripe\Core\Injector\Injector;
 use SilverStripe\ORM\DataObject;
 use SilverStripe\ORM\DB;
 use SilverStripe\ORM\Queries\SQLSelect;
@@ -145,6 +145,7 @@ abstract class DBComposite extends DBField
      * @param mixed $value
      * @param mixed $record Parent object to this field, which could be a DataObject, record array, or other
      * @param bool $markChanged
+     * @return $this
      */
     public function setValue($value, $record = null, $markChanged = true)
     {
@@ -172,6 +173,7 @@ abstract class DBComposite extends DBField
                 $this->setField($field, $record[$key]);
             }
         }
+        return $this;
     }
 
     /**
@@ -277,7 +279,7 @@ abstract class DBComposite extends DBField
         $key = $this->getName() . $field;
         $spec = $fields[$field];
         /** @var DBField $fieldObject */
-        $fieldObject = Object::create_from_string($spec, $key);
+        $fieldObject = Injector::inst()->create($spec, $key);
         $fieldObject->setValue($this->getField($field), null, false);
         return $fieldObject;
     }

src/ORM/FieldType/DBDecimal.php

@@ -72,7 +72,7 @@ class DBDecimal extends DBField
         if ($fieldName) {
             $dataObject->$fieldName = (float)preg_replace('/[^0-9.\-\+]/', '', $this->value);
         } else {
-            user_error("DBField::saveInto() Called on a nameless '" . get_class($this) . "' object", E_USER_ERROR);
+            user_error("DBField::saveInto() Called on a nameless '" . static::class . "' object", E_USER_ERROR);
         }
     }
 

src/ORM/FieldType/DBField.php

@@ -3,7 +3,6 @@
 namespace SilverStripe\ORM\FieldType;
 
 use SilverStripe\Core\Injector\Injector;
-use SilverStripe\Core\Object;
 use SilverStripe\Core\Convert;
 use SilverStripe\Forms\FormField;
 use SilverStripe\Forms\TextField;
@@ -132,9 +131,8 @@ abstract class DBField extends ViewableData
     public static function create_field($className, $value, $name = null, $object = null)
     {
         /** @var DBField $dbField */
-        $dbField = Object::create($className, $name, $object);
+        $dbField = Injector::inst()->create($className, $name, $object);
         $dbField->setValue($value, null, false);
-
         return $dbField;
     }
 
@@ -449,7 +447,7 @@ abstract class DBField extends ViewableData
         $fieldName = $this->name;
         if (empty($fieldName)) {
             throw new \BadMethodCallException(
-                "DBField::saveInto() Called on a nameless '" . get_class($this) . "' object"
+                "DBField::saveInto() Called on a nameless '" . static::class . "' object"
             );
         }
         $dataObject->$fieldName = $this->value;

src/ORM/FieldType/DBPolymorphicForeignKey.php

@@ -71,7 +71,7 @@ class DBPolymorphicForeignKey extends DBComposite
         if ($value instanceof DataObject) {
             $value = array(
                 'ID' => $value->ID,
-                'Class' => $value->class
+                'Class' => get_class($value),
             );
         }
 

src/ORM/Filters/SearchFilter.php

@@ -2,7 +2,7 @@
 
 namespace SilverStripe\ORM\Filters;
 
-use SilverStripe\Core\Object;
+use SilverStripe\Core\Injector\Injectable;
 use SilverStripe\ORM\DataObject;
 use SilverStripe\ORM\DataQuery;
 use InvalidArgumentException;
@@ -23,8 +23,9 @@ use SilverStripe\ORM\FieldType\DBField;
  *     class: EndsWithFilter
  * </code>
  */
-abstract class SearchFilter extends Object
+abstract class SearchFilter
 {
+    use Injectable;
 
     /**
      * @var string Classname of the inspected {@link DataObject}
@@ -79,7 +80,6 @@ abstract class SearchFilter extends Object
      */
     public function __construct($fullName = null, $value = false, array $modifiers = array())
     {
-        parent::__construct();
         $this->fullName = $fullName;
 
         // sets $this->name and $this->relation
@@ -178,7 +178,7 @@ abstract class SearchFilter extends Object
         $unsupported = array_diff($modifiers, $allowed);
         if ($unsupported) {
             throw new InvalidArgumentException(
-                get_class($this) . ' does not accept ' . implode(', ', $unsupported) . ' as modifiers'
+                static::class . ' does not accept ' . implode(', ', $unsupported) . ' as modifiers'
             );
         }
 
@@ -258,7 +258,7 @@ abstract class SearchFilter extends Object
         // Ensure that we're dealing with a DataObject.
         if (!is_subclass_of($this->model, DataObject::class)) {
             throw new InvalidArgumentException(
-                "Model supplied to " . get_class($this) . " should be an instance of DataObject."
+                "Model supplied to " . static::class . " should be an instance of DataObject."
             );
         }
         $schema = DataObject::getSchema();
@@ -371,7 +371,7 @@ abstract class SearchFilter extends Object
      */
     protected function applyMany(DataQuery $query)
     {
-        throw new InvalidArgumentException(get_class($this) . " can't be used to filter by a list of items.");
+        throw new InvalidArgumentException(static::class . " can't be used to filter by a list of items.");
     }
 
     /**
@@ -409,7 +409,7 @@ abstract class SearchFilter extends Object
      */
     protected function excludeMany(DataQuery $query)
     {
-        throw new InvalidArgumentException(get_class($this) . " can't be used to filter by a list of items.");
+        throw new InvalidArgumentException(static::class . " can't be used to filter by a list of items.");
     }
 
     /**

src/ORM/Hierarchy/Hierarchy.php

@@ -122,10 +122,10 @@ class Hierarchy extends DataExtension
                 // Hierarchy is looping.
                 $validationResult->addError(
                     _t(
-                        'SilverStripe\\ORM\\Hierarchy\\Hierarchy.InfiniteLoopNotAllowed',
+                        __CLASS__ . '.InfiniteLoopNotAllowed',
                         'Infinite loop found within the "{type}" hierarchy. Please change the parent to resolve this',
                         'First argument is the class that makes up the hierarchy.',
-                        array('type' => $owner->class)
+                        array('type' => get_class($owner))
                     ),
                     'bad',
                     'INFINITE_LOOP'

src/ORM/ManyManyList.php

@@ -3,7 +3,7 @@
 namespace SilverStripe\ORM;
 
 use BadMethodCallException;
-use SilverStripe\Core\Object;
+use SilverStripe\Core\Injector\Injector;
 use SilverStripe\ORM\Queries\SQLSelect;
 use SilverStripe\ORM\Queries\SQLDelete;
 use SilverStripe\ORM\FieldType\DBComposite;
@@ -100,7 +100,7 @@ class ManyManyList extends RelationList
         $finalized = array();
 
         foreach ($this->extraFields as $field => $spec) {
-            $obj = Object::create_from_string($spec);
+            $obj = Injector::inst()->create($spec);
 
             if ($obj instanceof DBComposite) {
                 $this->_compositeExtraFields[$field] = array();
@@ -146,7 +146,7 @@ class ManyManyList extends RelationList
                     }
                 }
 
-                $obj = Object::create_from_string($this->extraFields[$fieldName], $fieldName);
+                $obj = Injector::inst()->create($this->extraFields[$fieldName], $fieldName);
                 $obj->setValue($value, null, false);
                 $add[$fieldName] = $obj;
             }
@@ -281,7 +281,7 @@ class ManyManyList extends RelationList
                 foreach ($this->extraFields as $fieldName => $fieldSpec) {
                     // Skip fields without an assignment
                     if (array_key_exists($fieldName, $extraFields)) {
-                        $fieldObject = Object::create_from_string($fieldSpec, $fieldName);
+                        $fieldObject = Injector::inst()->create($fieldSpec, $fieldName);
                         $fieldObject->setValue($extraFields[$fieldName]);
                         $fieldObject->writeToManipulation($manipulation[$this->joinTable]);
                     }

src/ORM/Search/FulltextSearchable.php

@@ -98,8 +98,6 @@ class FulltextSearchable extends DataExtension
         } else {
             $this->searchFields = $searchFields;
         }
-
-        parent::__construct();
     }
 
     public static function get_extra_config($class, $extensionClass, $args)

src/ORM/Search/SearchContext.php

@@ -4,7 +4,7 @@ namespace SilverStripe\ORM\Search;
 
 use SilverStripe\Control\HTTPRequest;
 use SilverStripe\Core\ClassInfo;
-use SilverStripe\Core\Object;
+use SilverStripe\Core\Injector\Injectable;
 use SilverStripe\Forms\FieldList;
 use SilverStripe\Forms\FormField;
 use SilverStripe\ORM\DataObject;
@@ -34,8 +34,9 @@ use Exception;
 *
 * @see http://doc.silverstripe.com/doku.php?id=searchcontext
 */
-class SearchContext extends Object
+class SearchContext
 {
+    use Injectable;
 
     /**
      * DataObject subclass to which search parameters relate to.
@@ -85,8 +86,6 @@ class SearchContext extends Object
         $this->modelClass = $modelClass;
         $this->fields = ($fields) ? $fields : new FieldList();
         $this->filters = ($filters) ? $filters : array();
-
-        parent::__construct();
     }
 
     /**
@@ -136,6 +135,7 @@ class SearchContext extends Object
     public function getQuery($searchParams, $sort = false, $limit = false, $existingQuery = null)
     {
         /** DataList $query */
+        $query = null;
         if ($existingQuery) {
             if (!($existingQuery instanceof DataList)) {
                 throw new InvalidArgumentException("existingQuery must be DataList");
@@ -158,6 +158,7 @@ class SearchContext extends Object
             $query = $query->limit($limit);
         }
 
+        /** @var DataList $query */
         $query = $query->sort($sort);
 
         // hack to work with $searchParems when it's an Object

src/ORM/UnsavedRelationList.php

@@ -51,7 +51,7 @@ class UnsavedRelationList extends ArrayList implements Relation
     /**
      * Create a new UnsavedRelationList
      *
-     * @param array $baseClass
+     * @param string $baseClass
      * @param string $relationName
      * @param string $dataClass The DataObject class used in the relation
      */

src/Security/Authenticator.php

@@ -2,9 +2,10 @@
 
 namespace SilverStripe\Security;
 
-use SilverStripe\Core\Object;
+use SilverStripe\Core\Config\Configurable;
+use SilverStripe\Core\Extensible;
+use SilverStripe\Core\Injector\Injectable;
 use SilverStripe\Control\Controller;
-use SilverStripe\Dev\Deprecation;
 use SilverStripe\Forms\Form;
 
 /**
@@ -15,8 +16,16 @@ use SilverStripe\Forms\Form;
  *
  * @author Markus Lanthaler <markus@silverstripe.com>
  */
-abstract class Authenticator extends Object
+abstract class Authenticator
 {
+    use Injectable;
+    use Configurable;
+    use Extensible;
+
+    public function __construct()
+    {
+        $this->constructExtensions();
+    }
 
     /**
      * This variable holds all authenticators that should be used

src/Security/PasswordValidator.php

@@ -2,7 +2,8 @@
 
 namespace SilverStripe\Security;
 
-use SilverStripe\Core\Object;
+use SilverStripe\Core\Config\Configurable;
+use SilverStripe\Core\Injector\Injectable;
 use SilverStripe\ORM\ValidationResult;
 
 /**
@@ -17,9 +18,15 @@ use SilverStripe\ORM\ValidationResult;
  * Member::set_password_validator($pwdValidator);
  * </code>
  */
-class PasswordValidator extends Object
+class PasswordValidator
 {
+    use Injectable;
+    use Configurable;
 
+    /**
+     * @config
+     * @var array
+     */
     private static $character_strength_tests = array(
         'lowercase' => '/[a-z]/',
         'uppercase' => '/[A-Z]/',

src/Security/Security.php

@@ -879,7 +879,7 @@ class Security extends Controller implements TemplateGlobalProvider
      */
     public function getTemplatesFor($action)
     {
-        $templates = SSViewer::get_templates_by_class(get_class($this), "_{$action}", __CLASS__);
+        $templates = SSViewer::get_templates_by_class(static::class, "_{$action}", __CLASS__);
         return array_merge(
             $templates,
             [

src/Security/SecurityToken.php

@@ -3,7 +3,8 @@
 namespace SilverStripe\Security;
 
 use SilverStripe\Control\HTTPRequest;
-use SilverStripe\Core\Object;
+use SilverStripe\Core\Config\Configurable;
+use SilverStripe\Core\Injector\Injectable;
 use SilverStripe\Control\Session;
 use SilverStripe\Control\Controller;
 use SilverStripe\Forms\FieldList;
@@ -34,8 +35,10 @@ use SilverStripe\View\TemplateGlobalProvider;
  *
  * @todo Make token name form specific for additional forgery protection.
  */
-class SecurityToken extends Object implements TemplateGlobalProvider
+class SecurityToken implements TemplateGlobalProvider
 {
+    use Configurable;
+    use Injectable;
 
     /**
      * @var string
@@ -63,7 +66,6 @@ class SecurityToken extends Object implements TemplateGlobalProvider
     public function __construct($name = null)
     {
         $this->name = ($name) ? $name : self::get_default_name();
-        parent::__construct();
     }
 
     /**

src/View/Parsers/HTMLCleaner.php

@@ -2,13 +2,16 @@
 
 namespace SilverStripe\View\Parsers;
 
-use SilverStripe\Core\Object;
+use SilverStripe\Core\Config\Configurable;
+use SilverStripe\Core\Injector\Injectable;
 
 /**
  * Base class for HTML cleaning implementations.
  */
-abstract class HTMLCleaner extends Object
+abstract class HTMLCleaner
 {
+    use Configurable;
+    use Injectable;
 
     /**
      * @var array
@@ -27,7 +30,6 @@ abstract class HTMLCleaner extends Object
      */
     public function __construct($config = null)
     {
-        parent::__construct();
         if ($config) {
             $config = array_merge($this->defaultConfig, $config);
         } else {

src/View/Parsers/SQLFormatter.php

@@ -2,7 +2,7 @@
 
 namespace SilverStripe\View\Parsers;
 
-use SilverStripe\Core\Object;
+use SilverStripe\Core\Injector\Injectable;
 
 /**
  * Format a SQL Query for better readable output in HTML or Plaintext.
@@ -12,8 +12,9 @@ use SilverStripe\Core\Object;
  *
  * @author Ingo Schommer, Silverstripe Ltd. (<firstname>@silverstripe.com)
  */
-class SQLFormatter extends Object
+class SQLFormatter
 {
+    use Injectable;
 
     protected static $newline_before_tokens = array(
         'SELECT',

src/View/Parsers/ShortcodeParser.php

@@ -3,7 +3,9 @@
 namespace SilverStripe\View\Parsers;
 
 use DOMNodeList;
-use SilverStripe\Core\Object;
+use SilverStripe\Core\Config\Configurable;
+use SilverStripe\Core\Extensible;
+use SilverStripe\Core\Injector\Injectable;
 use SilverStripe\Core\Injector\Injector;
 use InvalidArgumentException;
 use DOMElement;
@@ -16,8 +18,16 @@ use DOMElement;
  *
  * @see http://doc.silverstripe.org/framework/en/reference/shortcodes
  */
-class ShortcodeParser extends Object
+class ShortcodeParser
 {
+    use Injectable;
+    use Configurable;
+    use Extensible;
+
+    public function __construct()
+    {
+        $this->constructExtensions();
+    }
 
     public function img_shortcode($attrs)
     {

src/View/Parsers/Transliterator.php

@@ -2,7 +2,8 @@
 
 namespace SilverStripe\View\Parsers;
 
-use SilverStripe\Core\Object;
+use SilverStripe\Core\Config\Configurable;
+use SilverStripe\Core\Injector\Injectable;
 
 /**
  * Support class for converting unicode strings into a suitable 7-bit ASCII equivalent.
@@ -14,8 +15,11 @@ use SilverStripe\Core\Object;
  * $ascii = $tr->toASCII($unicode);
  * </code>
  */
-class Transliterator extends Object
+class Transliterator
 {
+    use Injectable;
+    use Configurable;
+
     /**
      * @config
      * @var boolean Allow the use of iconv() to perform transliteration.  Set to false to disable.
@@ -53,11 +57,11 @@ class Transliterator extends Object
             'Õ'=>'O', 'Ö'=>'Oe', 'Ø'=>'O', 'Ù'=>'U', 'Ú'=>'U', 'Û'=>'U', 'Ü'=>'Ue', 'Ý'=>'Y', 'Þ'=>'B', 'ß'=>'ss',
             'à'=>'a', 'á'=>'a', 'â'=>'a', 'ã'=>'a', 'ä'=>'ae', 'å'=>'a', 'æ'=>'ae', 'ç'=>'c', 'è'=>'e', 'é'=>'e',
             'ê'=>'e', 'ë'=>'e', 'ì'=>'i', 'í'=>'i', 'î'=>'i', 'ï'=>'i', 'ð'=>'o', 'ñ'=>'n', 'ò'=>'o', 'ó'=>'o',
-            'ô'=>'o', 'õ'=>'o', 'ö'=>'oe', 'ø'=>'o', 'ù'=>'u', 'ú'=>'u', 'û'=>'u', 'ü'=>'ue', 'ý'=>'y', 'ý'=>'y',
+            'ô'=>'o', 'õ'=>'o', 'ö'=>'oe', 'ø'=>'o', 'ù'=>'u', 'ú'=>'u', 'û'=>'u', 'ü'=>'ue', 'ý'=>'y',
             'þ'=>'b', 'ÿ'=>'y', 'Ŕ'=>'R', 'ŕ'=>'r',
             'Ā'=>'A', 'ā'=>'a', 'Ē'=>'E', 'ē'=>'e', 'Ī'=>'I', 'ī'=>'i', 'Ō'=>'O', 'ō'=>'o', 'Ū'=>'U', 'ū'=>'u',
-            'œ'=>'oe', 'ß'=>'ss', 'ij'=>'ij', 'ą'=>'a','ę'=>'e', 'ė'=>'e', 'į'=>'i','ų'=>'u','ū'=>'u', 'Ą'=>'A',
+            'œ'=>'oe', 'ij'=>'ij', 'ą'=>'a','ę'=>'e', 'ė'=>'e', 'į'=>'i', 'ų'=>'u', 'Ą'=>'A',
-            'Ę'=>'E', 'Ė'=>'E', 'Į'=>'I','Ų'=>'U','Ū'=>'U',
+            'Ę'=>'E', 'Ė'=>'E', 'Į'=>'I','Ų'=>'U',
             "ľ"=>"l", "Ľ"=>"L", "ť"=>"t", "Ť"=>"T", "ů"=>"u", "Ů"=>"U",
             'ł'=>'l', 'Ł'=>'L', 'ń'=>'n', 'Ń'=>'N', 'ś'=>'s', 'Ś'=>'S', 'ź'=>'z', 'Ź'=>'Z', 'ż'=>'z', 'Ż'=>'Z',
             'а'=>"a",'б'=>"b",'в'=>"v",'г'=>"g",'д'=>"d",'е'=>"e",'ё'=>"yo",'ж'=>"zh",'з'=>"z",'и'=>"i",

src/View/Parsers/URLSegmentFilter.php

@@ -2,7 +2,8 @@
 
 namespace SilverStripe\View\Parsers;
 
-use SilverStripe\Core\Object;
+use SilverStripe\Core\Config\Configurable;
+use SilverStripe\Core\Injector\Injectable;
 
 /**
  * Filter certain characters from "URL segments" (also called "slugs"), for nicer (more SEO-friendly) URLs.
@@ -14,8 +15,10 @@ use SilverStripe\Core\Object;
  *
  * See {@link FileNameFilter} for similar implementation for filesystem-based URLs.
  */
-class URLSegmentFilter extends Object
+class URLSegmentFilter
 {
+    use Configurable;
+    use Injectable;
 
     /**
      * @config

src/View/SSViewer.php

@@ -313,7 +313,7 @@ class SSViewer implements Flushable
     /**
      * Returns true if at least one of the listed templates exists.
      *
-     * @param array $templates
+     * @param array|string $templates
      *
      * @return boolean
      */

src/View/SSViewer_DataPresenter.php

@@ -5,7 +5,6 @@ namespace SilverStripe\View;
 use InvalidArgumentException;
 use SilverStripe\Core\ClassInfo;
 use SilverStripe\Core\Injector\Injector;
-use SilverStripe\Core\Object;
 
 /**
  * This extends SSViewer_Scope to mix in data on top of what the item provides. This can be "global"
@@ -304,7 +303,7 @@ class SSViewer_DataPresenter extends SSViewer_Scope
         if ($val) {
             $obj = $val['obj'];
             if ($name === 'hasValue') {
-                $res = $obj instanceof Object
+                $res = $obj instanceof ViewableData
                     ? $obj->exists()
                     : (bool)$obj;
             } else {

src/View/ViewableData.php

@@ -2,7 +2,10 @@
 
 namespace SilverStripe\View;
 
-use SilverStripe\Core\Object;
+use Exception;
+use SilverStripe\Core\Config\Configurable;
+use SilverStripe\Core\Extensible;
+use SilverStripe\Core\Injector\Injectable;
 use SilverStripe\ORM\ArrayLib;
 use SilverStripe\ORM\FieldType\DBField;
 use SilverStripe\ORM\FieldType\DBHTMLText;
@@ -23,8 +26,13 @@ use ArrayIterator;
  * is provided and automatically escaped by ViewableData. Any class that needs to be available to a view (controllers,
  * {@link DataObject}s, page controls) should inherit from this class.
  */
-class ViewableData extends Object implements IteratorAggregate
+class ViewableData implements IteratorAggregate
 {
+    use Extensible {
+        defineMethods as extensibleDefineMethods;
+    }
+    use Injectable;
+    use Configurable;
 
     /**
      * An array of objects to cast certain fields to. This is set up as an array in the format:
@@ -75,6 +83,11 @@ class ViewableData extends Object implements IteratorAggregate
      */
     private $objCache = array();
 
+    public function __construct()
+    {
+        $this->constructExtensions();
+    }
+
     // -----------------------------------------------------------------------------------------------------------------
 
     // FIELD GETTERS & SETTERS -----------------------------------------------------------------------------------------
@@ -218,11 +231,12 @@ class ViewableData extends Object implements IteratorAggregate
             $this->addMethodsFrom('failover');
 
             if (isset($_REQUEST['debugfailover'])) {
-                Debug::message("$this->class created with a failover class of {$this->failover->class}");
+                $class = static::class;
+                $failoverClass = get_class($this->failover);
+                Debug::message("$class created with a failover class of {$failoverClass}");
             }
         }
-
+        $this->extensibleDefineMethods();
-        parent::defineMethods();
     }
 
     /**
@@ -249,6 +263,27 @@ class ViewableData extends Object implements IteratorAggregate
         );
     }
 
+    /**
+     * Return true if this object "exists" i.e. has a sensible value
+     *
+     * This method should be overriden in subclasses to provide more context about the classes state. For example, a
+     * {@link DataObject} class could return false when it is deleted from the database
+     *
+     * @return bool
+     */
+    public function exists()
+    {
+        return true;
+    }
+
+    /**
+     * @return string the class name
+     */
+    public function __toString()
+    {
+        return static::class;
+    }
+
     /**
      * @return ViewableData
      */
@@ -273,6 +308,7 @@ class ViewableData extends Object implements IteratorAggregate
      *
      * @param string $field
      * @return string Casting helper As a constructor pattern, and may include arguments.
+     * @throws Exception
      */
     public function castingHelper($field)
     {
@@ -295,7 +331,7 @@ class ViewableData extends Object implements IteratorAggregate
         // Fall back to default_cast
         $default = $this->config()->get('default_cast');
         if (empty($default)) {
-            throw new \Exception("No default_cast");
+            throw new Exception("No default_cast");
         }
         return $default;
     }
@@ -448,7 +484,7 @@ class ViewableData extends Object implements IteratorAggregate
         if (!is_object($value)) {
             // Force cast
             $castingHelper = $this->castingHelper($fieldName);
-            $valueObject = Object::create_from_string($castingHelper, $fieldName);
+            $valueObject = Injector::inst()->create($castingHelper, $fieldName);
             $valueObject->setValue($value, $this);
             $value = $valueObject;
         }
@@ -564,7 +600,7 @@ class ViewableData extends Object implements IteratorAggregate
     public function CSSClasses($stopAtClass = self::class)
     {
         $classes       = array();
-        $classAncestry = array_reverse(ClassInfo::ancestry($this->class));
+        $classAncestry = array_reverse(ClassInfo::ancestry(static::class));
         $stopClasses   = ClassInfo::ancestry($stopAtClass);
 
         foreach ($classAncestry as $class) {

src/View/ViewableData_Debugger.php

@@ -42,15 +42,16 @@ class ViewableData_Debugger extends ViewableData
     public function forTemplate($field = null)
     {
         // debugging info for a specific field
+        $class = get_class($this->object);
         if ($field) {
-            return "<b>Debugging Information for {$this->class}->{$field}</b><br/>" .
+            return "<b>Debugging Information for {$class}->{$field}</b><br/>" .
                 ($this->object->hasMethod($field) ? "Has method '$field'<br/>" : null) .
                 ($this->object->hasField($field) ? "Has field '$field'<br/>" : null);
         }
 
         // debugging information for the entire class
         $reflector = new ReflectionObject($this->object);
-        $debug = "<b>Debugging Information: all methods available in '{$this->object->class}'</b><br/><ul>";
+        $debug = "<b>Debugging Information: all methods available in '{$class}'</b><br/><ul>";
 
         foreach ($this->object->allMethodNames() as $method) {
             // check that the method is public
@@ -74,7 +75,7 @@ class ViewableData_Debugger extends ViewableData
         $debug .= '</ul>';
 
         if ($this->object->hasMethod('toMap')) {
-            $debug .= "<b>Debugging Information: all fields available in '{$this->object->class}'</b><br/><ul>";
+            $debug .= "<b>Debugging Information: all fields available in '{$class}'</b><br/><ul>";
 
             foreach ($this->object->toMap() as $field => $value) {
                 $debug .= "<li>\$$field</li>";

tests/php/Core/ClassInfoTest.php

@@ -2,7 +2,7 @@
 
 namespace SilverStripe\Core\Tests;
 
-use SilverStripe\Core\Object;
+use ReflectionException;
 use SilverStripe\Core\Tests\ClassInfoTest\BaseClass;
 use SilverStripe\Core\Tests\ClassInfoTest\BaseDataClass;
 use SilverStripe\Core\Tests\ClassInfoTest\ChildClass;
@@ -39,8 +39,8 @@ class ClassInfoTest extends SapphireTest
 
     public function testExists()
     {
-        $this->assertTrue(ClassInfo::exists('SilverStripe\\Core\\Object'));
+        $this->assertTrue(ClassInfo::exists(ClassInfo::class));
-        $this->assertTrue(ClassInfo::exists('SilverStripe\\Core\\object'));
+        $this->assertTrue(ClassInfo::exists('SilverStripe\\Core\\classinfo'));
         $this->assertTrue(ClassInfo::exists('SilverStripe\\Core\\Tests\\ClassInfoTest'));
         $this->assertTrue(ClassInfo::exists('SilverStripe\\Core\\Tests\\CLASSINFOTEST'));
         $this->assertTrue(ClassInfo::exists('stdClass'));
@@ -89,7 +89,8 @@ class ClassInfoTest extends SapphireTest
 
     public function testNonClassName()
     {
-        $this->setExpectedException('ReflectionException', 'Class IAmAClassThatDoesNotExist does not exist');
+        $this->expectException(ReflectionException::class);
+        $this->expectExceptionMessage('Class IAmAClassThatDoesNotExist does not exist');
         $this->assertEquals('IAmAClassThatDoesNotExist', ClassInfo::class_name('IAmAClassThatDoesNotExist'));
     }
 
@@ -117,15 +118,12 @@ class ClassInfoTest extends SapphireTest
     public function testAncestry()
     {
         $ancestry = ClassInfo::ancestry(ChildClass::class);
-        $expect = ArrayLib::valuekey(
+        $expect = ArrayLib::valuekey([
-            array(
-            Object::class,
             ViewableData::class,
             DataObject::class,
             BaseClass::class,
             ChildClass::class,
-            )
+        ]);
-        );
         $this->assertEquals($expect, $ancestry);
 
         ClassInfo::reset_db_cache();

tests/php/Core/Config/ConfigTest.php

@@ -3,7 +3,6 @@
 namespace SilverStripe\Core\Tests\Config;
 
 use SilverStripe\Config\MergeStrategy\Priority;
-use SilverStripe\Core\Object;
 use SilverStripe\Core\Config\Config;
 use SilverStripe\Dev\SapphireTest;
 
@@ -260,21 +259,6 @@ class ConfigTest extends SapphireTest
         );
     }
 
-    public function testStaticLookup()
-    {
-        $this->assertEquals(Object::static_lookup(ConfigTest\DefinesFoo::class, 'foo'), 1);
-        $this->assertEquals(Object::static_lookup(ConfigTest\DefinesFoo::class, 'bar'), null);
-
-        $this->assertEquals(Object::static_lookup(ConfigTest\DefinesBar::class, 'foo'), null);
-        $this->assertEquals(Object::static_lookup(ConfigTest\DefinesBar::class, 'bar'), 2);
-
-        $this->assertEquals(Object::static_lookup(ConfigTest\DefinesFooAndBar::class, 'foo'), 3);
-        $this->assertEquals(Object::static_lookup(ConfigTest\DefinesFooAndBar::class, 'bar'), 3);
-
-        $this->assertEquals(Object::static_lookup(ConfigTest\DefinesFooDoesntExtendObject::class, 'foo'), 4);
-        $this->assertEquals(Object::static_lookup(ConfigTest\DefinesFooDoesntExtendObject::class, 'bar'), null);
-    }
-
     public function testForClass()
     {
         $config = ConfigTest\DefinesFoo::config();

tests/php/Core/Config/ConfigTest/BaseObject.php

@@ -0,0 +1,11 @@
+<?php
+
+namespace SilverStripe\Core\Tests\Config\ConfigTest;
+
+use SilverStripe\Core\Config\Configurable;
+use SilverStripe\Dev\TestOnly;
+
+class BaseObject implements TestOnly
+{
+    use Configurable;
+}

tests/php/Core/Config/ConfigTest/DefinesFoo.php

@@ -2,10 +2,7 @@
 
 namespace SilverStripe\Core\Tests\Config\ConfigTest;
 
-use SilverStripe\Core\Object;
+class DefinesFoo extends BaseObject
-use SilverStripe\Dev\TestOnly;
-
-class DefinesFoo extends Object implements TestOnly
 {
     protected static $foo = 1;
 

tests/php/Core/Config/ConfigTest/TestNest.php

@@ -2,10 +2,7 @@
 
 namespace SilverStripe\Core\Tests\Config\ConfigTest;
 
-use SilverStripe\Core\Object;
+class TestNest extends BaseObject
-use SilverStripe\Dev\TestOnly;
-
-class TestNest extends Object implements TestOnly
 {
     /**
      * @config

tests/php/Core/Injector/InjectorTest/SSObjectCreator.php

@@ -2,8 +2,10 @@
 
 namespace SilverStripe\Core\Tests\Injector\InjectorTest;
 
+use SilverStripe\Core\ClassInfo;
 use SilverStripe\Core\Injector\InjectionCreator;
-use SilverStripe\Core\Object;
+use SilverStripe\Core\Injector\Injector;
+use SilverStripe\Dev\TestOnly;
 
 /**
  * An example object creator that uses the SilverStripe class(arguments) mechanism for
@@ -11,8 +13,11 @@ use SilverStripe\Core\Object;
  *
  * @see https://github.com/silverstripe/sapphire
  */
-class SSObjectCreator extends InjectionCreator
+class SSObjectCreator extends InjectionCreator implements TestOnly
 {
+    /**
+     * @var Injector
+     */
     private $injector;
 
     public function __construct($injector)
@@ -25,7 +30,7 @@ class SSObjectCreator extends InjectionCreator
         if (strpos($class, '(') === false) {
             return parent::create($class, $params);
         } else {
-            list($class, $params) = Object::parse_class_spec($class);
+            list($class, $params) = ClassInfo::parse_class_spec($class);
             $params = $this->injector->convertServiceProperty($params);
             return parent::create($class, $params);
         }

tests/php/Core/Manifest/ClassManifestTest.php

@@ -154,7 +154,7 @@ class ClassManifestTest extends SapphireTest
      */
     public function testManifestWarnsAboutDuplicateClasses()
     {
-        $this->setExpectedException(Exception::class);
+        $this->expectException(Exception::class);
         new ClassManifest(dirname(__FILE__) . '/fixtures/classmanifest_duplicates', false);
     }
 }

tests/php/Core/Manifest/fixtures/namespaced_classmanifest/module/classes/ClassI.php

@@ -12,7 +12,7 @@ use SilverStripe\Control\HTTPRequest as Request, SilverStripe\Control\HTTPRespon
 /** @skipUpgrade */
 use silverstripe\test\ClassA;
 /** @skipUpgrade */
-use \SilverStripe\Core\Object;
+use \SilverStripe\Core\ClassInfo;
 
 /** @skipUpgrade */
 class ClassI extends ModelAdmin implements P {

tests/php/Core/ObjectTest.php

@@ -2,7 +2,7 @@
 
 namespace SilverStripe\Core\Tests;
 
-use SilverStripe\Core\Object;
+use SilverStripe\Core\ClassInfo;
 use SilverStripe\Core\Injector\Injector;
 use SilverStripe\Core\Tests\ObjectTest\ExtendTest1;
 use SilverStripe\Core\Tests\ObjectTest\ExtendTest2;
@@ -52,7 +52,7 @@ class ObjectTest extends SapphireTest
             foreach ($trueMethods as $method) {
                 $methodU = strtoupper($method);
                 $methodL = strtoupper($method);
-                $this->assertTrue($obj->hasMethod($method), "Test that obj#$i has method $method ($obj->class)");
+                $this->assertTrue($obj->hasMethod($method), "Test that obj#$i has method $method");
                 $this->assertTrue($obj->hasMethod($methodU), "Test that obj#$i has method $methodU");
                 $this->assertTrue($obj->hasMethod($methodL), "Test that obj#$i has method $methodL");
 
@@ -73,32 +73,21 @@ class ObjectTest extends SapphireTest
 
     public function testSingletonCreation()
     {
-        $myObject = singleton(MyObject::class);
+        $myObject = MyObject::singleton();
-        $this->assertEquals(
+        $this->assertInstanceOf(
-            $myObject->class,
             MyObject::class,
+            $myObject,
             'singletons are creating a correct class instance'
         );
-        $this->assertEquals(
+        $mySubObject = MySubObject::singleton();
-            get_class($myObject),
+        $this->assertInstanceOf(
-            MyObject::class,
-            'singletons are creating a correct class instance'
-        );
-
-        $mySubObject = singleton(MySubObject::class);
-        $this->assertEquals(
-            $mySubObject->class,
-            MySubObject::class,
-            'singletons are creating a correct subclass instance'
-        );
-        $this->assertEquals(
-            get_class($mySubObject),
             MySubObject::class,
+            $mySubObject,
             'singletons are creating a correct subclass instance'
         );
 
-        $myFirstObject = singleton(MyObject::class);
+        $myFirstObject = MyObject::singleton();
-        $mySecondObject = singleton(MyObject::class);
+        $mySecondObject = MyObject::singleton();
         $this->assertTrue(
             $myFirstObject === $mySecondObject,
             'singletons are using the same object on subsequent calls'
@@ -182,14 +171,14 @@ class ObjectTest extends SapphireTest
                 'SilverStripe\\Core\\Tests\\oBjEcTTEST\\EXTENDTest1',
                 "SilverStripe\\Core\\Tests\\ObjectTest\\ExtendTest2",
             ),
-            Object::get_extensions(ExtensionTest::class)
+            ExtensionTest::get_extensions()
         );
         $this->assertEquals(
             array(
                 'SilverStripe\\Core\\Tests\\oBjEcTTEST\\EXTENDTest1',
                 "SilverStripe\\Core\\Tests\\ObjectTest\\ExtendTest2('FOO', 'BAR')",
             ),
-            Object::get_extensions(ExtensionTest::class, true)
+            ExtensionTest::get_extensions(null, true)
         );
         $inst = new ExtensionTest();
         $extensions = $inst->getExtensionInstances();
@@ -336,7 +325,7 @@ class ObjectTest extends SapphireTest
 
         ObjectTest\ExtensionRemoveTest::remove_extension(ExtendTest2::class);
         $this->assertFalse(
-            Object::has_extension(ExtensionRemoveTest::class, ExtendTest2::class),
+            ExtensionRemoveTest::has_extension(ExtendTest2::class),
             "Extension added through \$add_extension() are detected as removed in has_extension()"
         );
 
@@ -347,14 +336,9 @@ class ObjectTest extends SapphireTest
         );
     }
 
-    public function testParentClass()
-    {
-        $this->assertEquals(ObjectTest\MyObject::create()->parentClass(), 'SilverStripe\\Core\\Object');
-    }
-
     public function testIsA()
     {
-        $this->assertTrue(ObjectTest\MyObject::create() instanceof Object);
+        $this->assertTrue(ObjectTest\MyObject::create() instanceof ObjectTest\BaseObject);
         $this->assertTrue(ObjectTest\MyObject::create() instanceof ObjectTest\MyObject);
     }
 
@@ -369,30 +353,6 @@ class ObjectTest extends SapphireTest
         $this->assertTrue($obj->getExtensionInstance(TestExtension::class) instanceof ObjectTest\TestExtension);
     }
 
-    public function testCacheToFile()
-    {
-        $this->markTestIncomplete();
-        /*
-        // This doesn't run properly on our build slave.
-        $obj = new ObjectTest_CacheTest();
-
-        $obj->clearCache('cacheMethod');
-        $obj->clearCache('cacheMethod', null, array(true));
-        $obj->clearCache('incNumber');
-
-        $this->assertEquals('noarg', $obj->cacheToFile('cacheMethod', -1));
-        $this->assertEquals('hasarg', $obj->cacheToFile('cacheMethod', -1, null, array(true)));
-        $this->assertEquals('hasarg', $obj->cacheToFile('cacheMethod', 3600, null, array(true)));
-
-        // -1 lifetime will ensure that the cache isn't read - number incremented
-        $this->assertEquals(1, $obj->cacheToFile('incNumber', -1));
-        // -1 lifetime will ensure that the cache isn't read - number incremented
-        $this->assertEquals(2, $obj->cacheToFile('incNumber', -1));
-        // Number shouldn't be incremented now because we're using the cached version
-        $this->assertEquals(2, $obj->cacheToFile('incNumber'));
-        */
-    }
-
     public function testExtend()
     {
         $object   = new ObjectTest\ExtendTest();
@@ -434,52 +394,52 @@ class ObjectTest extends SapphireTest
         // Simple case
         $this->assertEquals(
             array(Versioned::class,array('Stage', 'Live')),
-            Object::parse_class_spec("SilverStripe\\Versioned\\Versioned('Stage','Live')")
+            ClassInfo::parse_class_spec("SilverStripe\\Versioned\\Versioned('Stage','Live')")
         );
         // String with commas
         $this->assertEquals(
             array(Versioned::class,array('Stage,Live', 'Stage')),
-            Object::parse_class_spec("SilverStripe\\Versioned\\Versioned('Stage,Live','Stage')")
+            ClassInfo::parse_class_spec("SilverStripe\\Versioned\\Versioned('Stage,Live','Stage')")
         );
         // String with quotes
         $this->assertEquals(
             array(Versioned::class,array('Stage\'Stage,Live\'Live', 'Live')),
-            Object::parse_class_spec("SilverStripe\\Versioned\\Versioned('Stage\\'Stage,Live\\'Live','Live')")
+            ClassInfo::parse_class_spec("SilverStripe\\Versioned\\Versioned('Stage\\'Stage,Live\\'Live','Live')")
         );
 
         // True, false and null values
         $this->assertEquals(
             array('ClassName', array('string', true, array('string', false))),
-            Object::parse_class_spec('ClassName("string", true, array("string", false))')
+            ClassInfo::parse_class_spec('ClassName("string", true, array("string", false))')
         );
         $this->assertEquals(
             array('ClassName', array(true, false, null)),
-            Object::parse_class_spec('ClassName(true, false, null)')
+            ClassInfo::parse_class_spec('ClassName(true, false, null)')
         );
 
         // Array
         $this->assertEquals(
             array('Enum',array(array('Accepted', 'Pending', 'Declined', 'Unsubmitted'), 'Unsubmitted')),
-            Object::parse_class_spec("Enum(array('Accepted', 'Pending', 'Declined', 'Unsubmitted'), 'Unsubmitted')")
+            ClassInfo::parse_class_spec("Enum(array('Accepted', 'Pending', 'Declined', 'Unsubmitted'), 'Unsubmitted')")
         );
         // Nested array
         $this->assertEquals(
             array('Enum',array(array('Accepted', 'Pending', 'Declined', array('UnsubmittedA','UnsubmittedB')),
                 'Unsubmitted')),
-            Object::parse_class_spec(
+            ClassInfo::parse_class_spec(
                 "Enum(array('Accepted', 'Pending', 'Declined', array('UnsubmittedA','UnsubmittedB')), 'Unsubmitted')"
             )
         );
         // 5.4 Shorthand Array
         $this->assertEquals(
             array('Enum',array(array('Accepted', 'Pending', 'Declined', 'Unsubmitted'), 'Unsubmitted')),
-            Object::parse_class_spec("Enum(['Accepted', 'Pending', 'Declined', 'Unsubmitted'], 'Unsubmitted')")
+            ClassInfo::parse_class_spec("Enum(['Accepted', 'Pending', 'Declined', 'Unsubmitted'], 'Unsubmitted')")
         );
         // 5.4 Nested shorthand array
         $this->assertEquals(
             array('Enum',array(array('Accepted', 'Pending', 'Declined', array('UnsubmittedA','UnsubmittedB')),
                 'Unsubmitted')),
-            Object::parse_class_spec(
+            ClassInfo::parse_class_spec(
                 "Enum(['Accepted', 'Pending', 'Declined', ['UnsubmittedA','UnsubmittedB']], 'Unsubmitted')"
             )
         );
@@ -487,33 +447,33 @@ class ObjectTest extends SapphireTest
         // Associative array
         $this->assertEquals(
             array('Varchar', array(255, array('nullifyEmpty' => false))),
-            Object::parse_class_spec("Varchar(255, array('nullifyEmpty' => false))")
+            ClassInfo::parse_class_spec("Varchar(255, array('nullifyEmpty' => false))")
         );
         // Nested associative array
         $this->assertEquals(
             array('Test', array('string', array('nested' => array('foo' => 'bar')))),
-            Object::parse_class_spec("Test('string', array('nested' => array('foo' => 'bar')))")
+            ClassInfo::parse_class_spec("Test('string', array('nested' => array('foo' => 'bar')))")
         );
         // 5.4 shorthand associative array
         $this->assertEquals(
             array('Varchar', array(255, array('nullifyEmpty' => false))),
-            Object::parse_class_spec("Varchar(255, ['nullifyEmpty' => false])")
+            ClassInfo::parse_class_spec("Varchar(255, ['nullifyEmpty' => false])")
         );
         // 5.4 shorthand nested associative array
         $this->assertEquals(
             array('Test', array('string', array('nested' => array('foo' => 'bar')))),
-            Object::parse_class_spec("Test('string', ['nested' => ['foo' => 'bar']])")
+            ClassInfo::parse_class_spec("Test('string', ['nested' => ['foo' => 'bar']])")
         );
 
         // Namespaced class
         $this->assertEquals(
             array('Test\MyClass', array()),
-            Object::parse_class_spec('Test\MyClass')
+            ClassInfo::parse_class_spec('Test\MyClass')
         );
         // Fully qualified namespaced class
         $this->assertEquals(
             array('\Test\MyClass', array()),
-            Object::parse_class_spec('\Test\MyClass')
+            ClassInfo::parse_class_spec('\Test\MyClass')
         );
     }
 }

tests/php/Core/ObjectTest/BaseObject.php

@@ -0,0 +1,20 @@
+<?php
+
+namespace SilverStripe\Core\Tests\ObjectTest;
+
+use SilverStripe\Core\Config\Configurable;
+use SilverStripe\Core\Extensible;
+use SilverStripe\Core\Injector\Injectable;
+use SilverStripe\Dev\TestOnly;
+
+class BaseObject implements TestOnly
+{
+    use Extensible;
+    use Configurable;
+    use Injectable;
+
+    public function __construct()
+    {
+        $this->constructExtensions();
+    }
+}

tests/php/Core/ObjectTest/CacheTest.php

@@ -2,11 +2,8 @@
 
 namespace SilverStripe\Core\Tests\ObjectTest;
 
-use SilverStripe\Core\Object;
+class CacheTest extends BaseObject
-
-class CacheTest extends Object
 {
-
     public $count = 0;
 
     public function cacheMethod($arg1 = null)

tests/php/Core/ObjectTest/CreateTest.php

@@ -2,9 +2,7 @@
 
 namespace SilverStripe\Core\Tests\ObjectTest;
 
-use SilverStripe\Core\Object;
+class CreateTest extends BaseObject
-
-class CreateTest extends Object
 {
     public $constructArguments;
 

tests/php/Core/ObjectTest/CreateTest2.php

@@ -2,8 +2,6 @@
 
 namespace SilverStripe\Core\Tests\ObjectTest;
 
-use SilverStripe\Core\Object;
+class CreateTest2 extends BaseObject
-
-class CreateTest2 extends Object
 {
 }

tests/php/Core/ObjectTest/CreateTest3.php

@@ -2,8 +2,6 @@
 
 namespace SilverStripe\Core\Tests\ObjectTest;
 
-use SilverStripe\Core\Object;
+class CreateTest3 extends BaseObject
-
-class CreateTest3 extends Object
 {
 }

tests/php/Core/ObjectTest/ExtendTest.php

@@ -2,9 +2,7 @@
 
 namespace SilverStripe\Core\Tests\ObjectTest;
 
-use SilverStripe\Core\Object;
+class ExtendTest extends BaseObject
-
-class ExtendTest extends Object
 {
     private static $extensions = array(
         ExtendTest1::class,

tests/php/Core/ObjectTest/ExtendTest1.php

@@ -3,8 +3,9 @@
 namespace SilverStripe\Core\Tests\ObjectTest;
 
 use SilverStripe\Core\Extension;
+use SilverStripe\Dev\TestOnly;
 
-class ExtendTest1 extends Extension
+class ExtendTest1 extends Extension implements TestOnly
 {
     public function extendableMethod(&$argument = null)
     {

tests/php/Core/ObjectTest/ExtendTest2.php

@@ -3,9 +3,17 @@
 namespace SilverStripe\Core\Tests\ObjectTest;
 
 use SilverStripe\Core\Extension;
+use SilverStripe\Dev\TestOnly;
 
-class ExtendTest2 extends Extension
+class ExtendTest2 extends Extension implements TestOnly
 {
+    protected $constructorArgs = [];
+
+    public function __construct()
+    {
+        $this->constructorArgs = func_get_args();
+    }
+
     public function extendableMethod($argument = null)
     {
         $args = implode(',', array_filter(func_get_args()));

tests/php/Core/ObjectTest/ExtendTest3.php

@@ -3,9 +3,17 @@
 namespace SilverStripe\Core\Tests\ObjectTest;
 
 use SilverStripe\Core\Extension;
+use SilverStripe\Dev\TestOnly;
 
-class ExtendTest3 extends Extension
+class ExtendTest3 extends Extension implements TestOnly
 {
+    protected $constructorArgs = [];
+
+    public function __construct()
+    {
+        $this->constructorArgs = func_get_args();
+    }
+
     public function extendableMethod($argument = null)
     {
         return "ExtendTest3($argument)";

tests/php/Core/ObjectTest/Extending.php

@@ -2,10 +2,7 @@
 
 namespace SilverStripe\Core\Tests\ObjectTest;
 
-use SilverStripe\Core\Object;
+class Extending extends BaseObject
-use SilverStripe\Dev\TestOnly;
-
-class Extending extends Object implements TestOnly
 {
 
     private static $extensions = array(

tests/php/Core/ObjectTest/ExtensionRemoveTest.php

@@ -2,9 +2,7 @@
 
 namespace SilverStripe\Core\Tests\ObjectTest;
 
-use SilverStripe\Core\Object;
+class ExtensionRemoveTest extends BaseObject
-
-class ExtensionRemoveTest extends Object
 {
     private static $extensions = array(
         ExtendTest1::class,

tests/php/Core/ObjectTest/ExtensionTest.php

@@ -2,9 +2,7 @@
 
 namespace SilverStripe\Core\Tests\ObjectTest;
 
-use SilverStripe\Core\Object;
+class ExtensionTest extends BaseObject
-
-class ExtensionTest extends Object
 {
     private static $extensions = array(
         'SilverStripe\\Core\\Tests\\oBjEcTTEST\\EXTENDTest1',

tests/php/Core/ObjectTest/ExtensionTest2.php

@@ -2,9 +2,7 @@
 
 namespace SilverStripe\Core\Tests\ObjectTest;
 
-use SilverStripe\Core\Object;
+class ExtensionTest2 extends BaseObject
-
-class ExtensionTest2 extends Object
 {
     private static $extensions = [
         TestExtension::class,

tests/php/Core/ObjectTest/ExtensionTest3.php

@@ -2,8 +2,6 @@
 
 namespace SilverStripe\Core\Tests\ObjectTest;
 
-use SilverStripe\Core\Object;
+class ExtensionTest3 extends BaseObject
-
-class ExtensionTest3 extends Object
 {
 }

tests/php/Core/ObjectTest/MyObject.php

@@ -2,14 +2,12 @@
 
 namespace SilverStripe\Core\Tests\ObjectTest;
 
-use SilverStripe\Core\Object;
+class MyObject extends BaseObject
-
-class MyObject extends Object
 {
     public $title = 'my object';
     /**
      * @config
-*/
+     */
     private static $mystaticProperty = "MyObject";
     static $mystaticArray = array('one');
 }

tests/php/Core/ObjectTest/T1A.php

@@ -2,9 +2,7 @@
 
 namespace SilverStripe\Core\Tests\ObjectTest;
 
-use SilverStripe\Core\Object;
+class T1A extends BaseObject
-
-class T1A extends Object
 {
     public function testMethod()
     {

tests/php/Core/ObjectTest/T1B.php

@@ -2,9 +2,7 @@
 
 namespace SilverStripe\Core\Tests\ObjectTest;
 
-use SilverStripe\Core\Object;
+class T1B extends BaseObject
-
-class T1B extends Object
 {
     public function someMethod()
     {

tests/php/Core/ObjectTest/T1C.php

@@ -2,9 +2,7 @@
 
 namespace SilverStripe\Core\Tests\ObjectTest;
 
-use SilverStripe\Core\Object;
+class T1C extends BaseObject
-
-class T1C extends Object
 {
     public function t1cMethod()
     {

tests/php/Core/ObjectTest/T2.php

@@ -2,9 +2,7 @@
 
 namespace SilverStripe\Core\Tests\ObjectTest;
 
-use SilverStripe\Core\Object;
+class T2 extends BaseObject
-
-class T2 extends Object
 {
     protected $failover;
     protected $failoverArr = array();

tests/php/Core/ObjectTest/TestExtension.php

@@ -3,7 +3,8 @@
 namespace SilverStripe\Core\Tests\ObjectTest;
 
 use SilverStripe\Core\Extension;
+use SilverStripe\Dev\TestOnly;
 
-class TestExtension extends Extension
+class TestExtension extends Extension implements TestOnly
 {
 }

tests/php/Forms/GridField/GridFieldDetailFormTest/TestController.php

@@ -37,14 +37,10 @@ class TestController extends Controller implements TestOnly
         $field->getConfig()->addComponent(new GridFieldAddNewButton('toolbar-header-right'));
         $field->getConfig()->addComponent(new GridFieldViewButton());
         $field->getConfig()->addComponent(new GridFieldEditButton());
-        /**
+        /** @skipUpgrade */
- * @skipUpgrade
-*/
         $field->getConfig()->addComponent($gridFieldForm = new GridFieldDetailForm($this, 'Form'));
         $field->getConfig()->addComponent(new GridFieldEditButton());
-        /**
+        /** @skipUpgrade */
- * @skipUpgrade
-*/
         return new Form($this, 'Form', new FieldList($field), new FieldList());
     }
 }

tests/php/ORM/DBHTMLTextTest.php

@@ -2,10 +2,11 @@
 
 namespace SilverStripe\ORM\Tests;
 
+use SilverStripe\Control\Director;
+use SilverStripe\Core\Injector\Injector;
 use SilverStripe\ORM\FieldType\DBHTMLText;
 use SilverStripe\ORM\FieldType\DBField;
 use SilverStripe\Core\Convert;
-use SilverStripe\Core\Object;
 use SilverStripe\Core\Config\Config;
 use SilverStripe\Dev\SapphireTest;
 use SilverStripe\ORM\Tests\DBHTMLTextTest\TestShortcode;
@@ -217,26 +218,24 @@ class DBHTMLTextTest extends SapphireTest
 
     public function testCreate()
     {
-        /**
+        /** @var DBHTMLText $field */
- * @var DBHTMLText $field
+        $field = Injector::inst()->create("HTMLFragment(['whitelist' => 'link'])", 'MyField');
-*/
-        $field = Object::create_from_string("HTMLFragment(['whitelist' => 'link'])", 'MyField');
         $this->assertEquals(['link'], $field->getWhitelist());
-        $field = Object::create_from_string("HTMLFragment(['whitelist' => 'link,a'])", 'MyField');
+        $field = Injector::inst()->create("HTMLFragment(['whitelist' => 'link,a'])", 'MyField');
         $this->assertEquals(['link', 'a'], $field->getWhitelist());
-        $field = Object::create_from_string("HTMLFragment(['whitelist' => ['link', 'a']])", 'MyField');
+        $field = Injector::inst()->create("HTMLFragment(['whitelist' => ['link', 'a']])", 'MyField');
         $this->assertEquals(['link', 'a'], $field->getWhitelist());
-        $field = Object::create_from_string("HTMLFragment", 'MyField');
+        $field = Injector::inst()->create("HTMLFragment", 'MyField');
         $this->assertEmpty($field->getWhitelist());
 
         // Test shortcodes
-        $field = Object::create_from_string("HTMLFragment(['shortcodes' => true])", 'MyField');
+        $field = Injector::inst()->create("HTMLFragment(['shortcodes' => true])", 'MyField');
         $this->assertEquals(true, $field->getProcessShortcodes());
-        $field = Object::create_from_string("HTMLFragment(['shortcodes' => false])", 'MyField');
+        $field = Injector::inst()->create("HTMLFragment(['shortcodes' => false])", 'MyField');
         $this->assertEquals(false, $field->getProcessShortcodes());
 
         // Mix options
-        $field = Object::create_from_string("HTMLFragment(['shortcodes' => true, 'whitelist' => ['a'])", 'MyField');
+        $field = Injector::inst()->create("HTMLFragment(['shortcodes' => true, 'whitelist' => ['a'])", 'MyField');
         $this->assertEquals(true, $field->getProcessShortcodes());
         $this->assertEquals(['a'], $field->getWhitelist());
     }
@@ -553,7 +552,7 @@ class DBHTMLTextTest extends SapphireTest
             $field->Plain()
         );
         Config::nest();
-        Config::inst()->update('SilverStripe\\Control\\Director', 'alternate_base_url', 'http://example.com/');
+        Director::config()->set('alternate_base_url', 'http://example.com/');
         $this->assertEquals(
             '<p>Replaced short code with this. <a href="http://example.com/home">home</a></p>',
             $field->AbsoluteLinks()

tests/php/ORM/DBStringTest.php

@@ -2,7 +2,7 @@
 
 namespace SilverStripe\ORM\Tests;
 
-use SilverStripe\Core\Object;
+use SilverStripe\Core\Injector\Injector;
 use SilverStripe\ORM\FieldType\DBField;
 use SilverStripe\ORM\FieldType\DBString;
 use SilverStripe\Dev\SapphireTest;
@@ -24,10 +24,8 @@ class DBStringTest extends SapphireTest
 
     public function testDefault()
     {
-        /**
+        /** @var DBString $dbField */
- * @var DBString $dbField
+        $dbField = Injector::inst()->create(
-*/
-        $dbField = Object::create_from_string(
             DBStringTest\MyStringField::class."(['default' => 'Here is my default text'])",
             'Myfield'
         );
@@ -42,9 +40,11 @@ class DBStringTest extends SapphireTest
      */
     public function testLowerCase()
     {
+        /** @var MyStringField $field */
+        $field = DBField::create_field(MyStringField::class, 'This is a TEST!');
         $this->assertEquals(
             'this is a test!',
-            DBField::create_field(MyStringField::class, 'This is a TEST!')->LowerCase()
+            $field->LowerCase()
         );
     }
 
@@ -53,9 +53,11 @@ class DBStringTest extends SapphireTest
      */
     public function testUpperCase()
     {
+        /** @var MyStringField $field */
+        $field = DBField::create_field(MyStringField::class, 'This is a TEST!');
         $this->assertEquals(
             'THIS IS A TEST!',
-            DBField::create_field(MyStringField::class, 'This is a TEST!')->UpperCase()
+            $field->UpperCase()
         );
     }
 

tests/php/ORM/DataObjectSchemaTest.php

@@ -2,7 +2,7 @@
 
 namespace SilverStripe\ORM\Tests;
 
-use SilverStripe\Core\Object;
+use SilverStripe\Core\ClassInfo;
 use SilverStripe\ORM\DataObject;
 use SilverStripe\Dev\SapphireTest;
 use SilverStripe\ORM\DataObjectSchema;
@@ -139,7 +139,7 @@ class DataObjectSchemaTest extends SapphireTest
         );
 
         $this->assertNull(
-            $schema->tableForField(Object::class, 'Title')
+            $schema->tableForField(ClassInfo::class, 'Title')
         );
 
         // Test fixed fields

tests/php/ORM/DataObjectTest.php

@@ -619,17 +619,17 @@ class DataObjectTest extends SapphireTest
 
         // Set the favourite team for fan1
         $fan1->setField('FavouriteID', $team1->ID);
-        $fan1->setField('FavouriteClass', $team1->class);
+        $fan1->setField('FavouriteClass', get_class($team1));
 
         $this->assertEquals($team1->ID, $fan1->Favourite()->ID, 'The team is assigned to fan 1');
-        $this->assertInstanceOf($team1->class, $fan1->Favourite(), 'The team is assigned to fan 1');
+        $this->assertInstanceOf(get_class($team1), $fan1->Favourite(), 'The team is assigned to fan 1');
         $this->assertEquals(
             $team1->ID,
             $fan1->getComponent('Favourite')->ID,
             'The team exists through the component getter'
         );
         $this->assertInstanceOf(
-            $team1->class,
+            get_class($team1),
             $fan1->getComponent('Favourite'),
             'The team exists through the component getter'
         );
@@ -847,10 +847,10 @@ class DataObjectTest extends SapphireTest
         // Test for polymorphic has_one relations
         $fan = $this->objFromFixture(DataObjectTest\Fan::class, 'fan1');
         $fan->FavouriteID = $team->ID;
-        $fan->FavouriteClass = $team->class;
+        $fan->FavouriteClass = DataObjectTest\Team::class;
         $this->assertNotNull($fan->Favourite());
         $this->assertEquals($team->ID, $fan->Favourite()->ID);
-        $this->assertInstanceOf($team->class, $fan->Favourite());
+        $this->assertInstanceOf(DataObjectTest\Team::class, $fan->Favourite());
     }
 
     public function testFieldNamesThatMatchMethodNamesWork()
@@ -1434,26 +1434,25 @@ class DataObjectTest extends SapphireTest
         $equipmentSuppliers = $team->EquipmentSuppliers();
 
         // Check that DataObject::many_many() works as expected
-        list($relationClass, $class, $targetClass, $parentField, $childField, $joinTable)
+        $manyManyComponent = DataObject::getSchema()->manyManyComponent(DataObjectTest\Team::class, 'Sponsors');
-            = DataObject::getSchema()->manyManyComponent(DataObjectTest\Team::class, 'Sponsors');
+        $this->assertEquals(ManyManyList::class, $manyManyComponent['relationClass']);
-        $this->assertEquals(ManyManyList::class, $relationClass);
         $this->assertEquals(
             DataObjectTest\Team::class,
-            $class,
+            $manyManyComponent['parentClass'],
             'DataObject::many_many() didn\'t find the correct base class'
         );
         $this->assertEquals(
             DataObjectTest\EquipmentCompany::class,
-            $targetClass,
+            $manyManyComponent['childClass'],
             'DataObject::many_many() didn\'t find the correct target class for the relation'
         );
         $this->assertEquals(
             'DataObjectTest_EquipmentCompany_SponsoredTeams',
-            $joinTable,
+            $manyManyComponent['join'],
             'DataObject::many_many() didn\'t find the correct relation table'
         );
-        $this->assertEquals('DataObjectTest_TeamID', $parentField);
+        $this->assertEquals('DataObjectTest_TeamID', $manyManyComponent['parentField']);
-        $this->assertEquals('DataObjectTest_EquipmentCompanyID', $childField);
+        $this->assertEquals('DataObjectTest_EquipmentCompanyID', $manyManyComponent['childField']);
 
         // Check that ManyManyList still works
         $this->assertEquals(2, $sponsors->count(), 'Rows are missing from relation');
@@ -1918,11 +1917,15 @@ class DataObjectTest extends SapphireTest
 
         // Test belongs_to assignment
         $company->OwnerID = $ceo->ID;
-        $company->OwnerClass = $ceo->class;
+        $company->OwnerClass = DataObjectTest\CEO::class;
         $company->write();
 
         $this->assertEquals($company->ID, $ceo->CompanyOwned()->ID, 'belongs_to returns the right results.');
-        $this->assertEquals($company->class, $ceo->CompanyOwned()->class, 'belongs_to returns the right results.');
+        $this->assertInstanceOf(
+            DataObjectTest\Company::class,
+            $ceo->CompanyOwned(),
+            'belongs_to returns the right results.'
+        );
 
         // Test automatic creation of class where no assigment exists
         $ceo = new DataObjectTest\CEO();

tests/php/ORM/ManyManyListExtensionTest.php

@@ -2,11 +2,7 @@
 
 namespace SilverStripe\ORM\Tests;
 
-use SilverStripe\ORM\DataObject;
-use SilverStripe\ORM\DataExtension;
-use SilverStripe\Core\Object;
 use SilverStripe\Dev\SapphireTest;
-use SilverStripe\Dev\TestOnly;
 
 class ManyManyListExtensionTest extends SapphireTest
 {
@@ -26,9 +22,10 @@ class ManyManyListExtensionTest extends SapphireTest
         // This extends ManyManyListTest_Secondary with the secondary extension that adds the relationship back
         // to the primary. The instance from the fixture is ManyManyListTest_SecondarySub, deliberately a sub-class of
         // the extended class.
-        Object::add_extension(ManyManyListTest\Secondary::class, ManyManyListTest\IndirectSecondaryExtension::class);
+        ManyManyListTest\Secondary::add_extension(ManyManyListTest\IndirectSecondaryExtension::class);
 
         // Test from the primary (not extended) to the secondary (which is extended)
+        /** @var ManyManyListTest\IndirectPrimary $primary */
         $primary = $this->objFromFixture(ManyManyListTest\IndirectPrimary::class, 'manymany_extra_primary');
         $secondaries = $primary->Secondary();
         $extraFields = $secondaries->getExtraFields();
@@ -37,6 +34,7 @@ class ManyManyListExtensionTest extends SapphireTest
         $this->assertTrue(isset($extraFields['DocumentSort']), 'has DocumentSort');
 
         // Test from the secondary (which is extended) to the primary (not extended)
+        /** @var ManyManyListTest\SecondarySub|ManyManyListTest\IndirectSecondaryExtension $secondary */
         $secondary = $this->objFromFixture(ManyManyListTest\SecondarySub::class, 'manymany_extra_secondary');
 
         $primaries = $secondary->Primary();

tests/php/ORM/ManyManyListTest/IndirectPrimary.php

@@ -4,11 +4,14 @@ namespace SilverStripe\ORM\Tests\ManyManyListTest;
 
 use SilverStripe\Dev\TestOnly;
 use SilverStripe\ORM\DataObject;
+use SilverStripe\ORM\ManyManyList;
 
 /**
  * A data object that implements the primary side of a many_many (where the extra fields are
  * defined.) The many-many refers to ManyManyListTest_Secondary rather than ManyManyListTest_SecondarySub
  * by design, because we're trying to test that a subclass instance picks up the extra fields of it's parent.
+ *
+ * @method ManyManyList Secondary()
  */
 class IndirectPrimary extends DataObject implements TestOnly
 {

tests/php/ORM/ManyManyListTest/IndirectSecondaryExtension.php

@@ -4,10 +4,13 @@ namespace SilverStripe\ORM\Tests\ManyManyListTest;
 
 use SilverStripe\Dev\TestOnly;
 use SilverStripe\ORM\DataExtension;
+use SilverStripe\ORM\ManyManyList;
 
 /**
  * An extension that is applied to ManyManyListTest_Secondary that
  * implements the other side of the many-many relationship.
+ *
+ * @method ManyManyList Primary()
  */
 class IndirectSecondaryExtension extends DataExtension implements TestOnly
 {

tests/php/ORM/ManyManyThroughListTest.php

@@ -160,12 +160,12 @@ class ManyManyThroughListTest extends SapphireTest
         // Parent components
         $this->assertEquals(
             [
-                ManyManyThroughList::class,
+                'relationClass' => ManyManyThroughList::class,
-                ManyManyThroughListTest\TestObject::class,
+                'parentClass' => ManyManyThroughListTest\TestObject::class,
-                ManyManyThroughListTest\Item::class,
+                'childClass' => ManyManyThroughListTest\Item::class,
-                'ParentID',
+                'parentField' => 'ParentID',
-                'ChildID',
+                'childField' => 'ChildID',
-                ManyManyThroughListTest\JoinObject::class
+                'join' => ManyManyThroughListTest\JoinObject::class
             ],
             $schema->manyManyComponent(ManyManyThroughListTest\TestObject::class, 'Items')
         );
@@ -173,12 +173,12 @@ class ManyManyThroughListTest extends SapphireTest
         // Belongs_many_many is the same, but with parent/child substituted
         $this->assertEquals(
             [
-                ManyManyThroughList::class,
+                'relationClass' => ManyManyThroughList::class,
-                ManyManyThroughListTest\Item::class,
+                'parentClass' => ManyManyThroughListTest\Item::class,
-                ManyManyThroughListTest\TestObject::class,
+                'childClass' => ManyManyThroughListTest\TestObject::class,
-                'ChildID',
+                'parentField' => 'ChildID',
-                'ParentID',
+                'childField' => 'ParentID',
-                ManyManyThroughListTest\JoinObject::class
+                'join' => ManyManyThroughListTest\JoinObject::class
             ],
             $schema->manyManyComponent(ManyManyThroughListTest\Item::class, 'Objects')
         );

tests/php/Security/MemberTest.php

@@ -3,7 +3,6 @@
 namespace SilverStripe\Security\Tests;
 
 use SilverStripe\Core\Convert;
-use SilverStripe\Core\Object;
 use SilverStripe\Dev\FunctionalTest;
 use SilverStripe\Control\Cookie;
 use SilverStripe\i18n\i18n;
@@ -27,14 +26,9 @@ class MemberTest extends FunctionalTest
 
     protected $orig = array();
 
-    protected static $illegal_extensions = array(
+    protected static $illegal_extensions = [
-        Member::class => array(
+        Member::class => '*',
-            // TODO Coupling with modules, this should be resolved by automatically
+    ];
-            // removing all applied extensions before a unit test
-            'ForumRole',
-            'OpenIDAuthenticatedRole'
-        )
-    );
 
     public function __construct()
     {
@@ -537,7 +531,6 @@ class MemberTest extends FunctionalTest
      */
     public function testCanManipulateOwnRecord()
     {
-        $extensions = $this->removeExtensions(Object::get_extensions(Member::class));
         $member = $this->objFromFixture(Member::class, 'test');
         $member2 = $this->objFromFixture(Member::class, 'staffmember');
 
@@ -560,13 +553,11 @@ class MemberTest extends FunctionalTest
         $this->assertFalse($member->canDelete());
         $this->assertFalse($member->canEdit());
 
-        $this->addExtensions($extensions);
         $this->session()->inst_set('loggedInAs', null);
     }
 
     public function testAuthorisedMembersCanManipulateOthersRecords()
     {
-        $extensions = $this->removeExtensions(Object::get_extensions(Member::class));
         $member = $this->objFromFixture(Member::class, 'test');
         $member2 = $this->objFromFixture(Member::class, 'staffmember');
 
@@ -575,14 +566,10 @@ class MemberTest extends FunctionalTest
         $this->assertTrue($member2->canView());
         $this->assertTrue($member2->canDelete());
         $this->assertTrue($member2->canEdit());
-
-        $this->addExtensions($extensions);
-        $this->session()->inst_set('loggedInAs', null);
     }
 
     public function testExtendedCan()
     {
-        $extensions = $this->removeExtensions(Object::get_extensions(Member::class));
         $member = $this->objFromFixture(Member::class, 'test');
 
         /* Normal behaviour is that you can't view a member unless canView() on an extension returns true */
@@ -617,7 +604,6 @@ class MemberTest extends FunctionalTest
         $this->assertTrue($member4->canEdit());
 
         Member::remove_extension(MemberTest\EditingAllowedDeletingDeniedExtension::class);
-        $this->addExtensions($extensions);
     }
 
     /**

tests/php/Security/MemberTest/TestPasswordValidator.php

@@ -8,7 +8,6 @@ class TestPasswordValidator extends PasswordValidator
 {
     public function __construct()
     {
-        parent::__construct();
         $this->minLength(7);
         $this->checkHistoricalPasswords(6);
         $this->characterStrength(3, array('lowercase', 'uppercase', 'digits', 'punctuation'));

tests/php/i18n/i18nTest/_fakewebroot/i18nothermodule/code/i18nOtherModule.php

@@ -1,8 +1,6 @@
 <?php
 
-use SilverStripe\Core\Object;
+class i18nOtherModule
-
-class i18nOtherModule extends Object
 {
     public function mymethod()
     {

tests/php/i18n/i18nTest/_fakewebroot/i18ntestmodule/code/i18nTestModule.php

@@ -1,7 +1,6 @@
 <?php
 
 use SilverStripe\ORM\DataObject;
-use SilverStripe\Core\Object;
 use SilverStripe\Dev\TestOnly;
 
 class i18nTestModule extends DataObject implements TestOnly
@@ -20,7 +19,7 @@ class i18nTestModule extends DataObject implements TestOnly
         );
     }
 }
-class i18nTestModule_Addition extends Object
+class i18nTestModule_Addition
 {
     public function myAdditionalMethod()
     {

tests/php/i18n/i18nTest/_fakewebroot/i18ntestmodule/code/subfolder/i18nTestSubModule.php

@@ -1,13 +1,9 @@
 <?php
 
-use SilverStripe\Core\Object;
+class i18nTestSubModule
-
-class i18nTestSubModule extends Object
 {
     public function __construct()
     {
         _t('i18nTestModule.OTHERENTITY', 'Other Entity');
-
-        parent::__construct();
     }
 }