silverstripe-framework/model/Versioned.php

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<?php
/**
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* The Versioned extension allows your DataObjects to have several versions,
* allowing you to rollback changes and view history. An example of this is
* the pages used in the CMS.
*
* @property int $Version
*
* @package framework
* @subpackage model
*/
class Versioned extends DataExtension implements TemplateGlobalProvider {
/**
* An array of possible stages.
* @var array
*/
protected $stages;
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/**
* The 'default' stage.
* @var string
*/
protected $defaultStage;
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/**
* The 'live' stage.
* @var string
*/
protected $liveStage;
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/**
* The default reading mode
*/
const DEFAULT_MODE = 'Stage.Live';
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/**
* A version that a DataObject should be when it is 'migrating',
* that is, when it is in the process of moving from one stage to another.
* @var string
*/
public $migratingVersion;
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/**
* A cache used by get_versionnumber_by_stage().
* Clear through {@link flushCache()}.
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*
* @var array
*/
protected static $cache_versionnumber;
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/**
* @var string
*/
protected static $reading_mode = null;
/**
* @var Boolean Flag which is temporarily changed during the write() process
* to influence augmentWrite() behaviour. If set to TRUE, no new version will be created
* for the following write. Needs to be public as other classes introspect this state
* during the write process in order to adapt to this versioning behaviour.
*/
public $_nextWriteWithoutVersion = false;
/**
* Additional database columns for the new
* "_versions" table. Used in {@link augmentDatabase()}
* and all Versioned calls extending or creating
* SELECT statements.
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*
* @var array $db_for_versions_table
*/
private static $db_for_versions_table = array(
"RecordID" => "Int",
"Version" => "Int",
"WasPublished" => "Boolean",
"AuthorID" => "Int",
"PublisherID" => "Int"
);
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/**
* @var array
*/
private static $db = array(
'Version' => 'Int'
);
/**
* Used to enable or disable the prepopulation of the version number cache.
* Defaults to true.
*
* @var boolean
*/
private static $prepopulate_versionnumber_cache = true;
/**
* Keep track of the archive tables that have been created.
*
* @var array
*/
private static $archive_tables = array();
/**
* Additional database indexes for the new
* "_versions" table. Used in {@link augmentDatabase()}.
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*
* @var array $indexes_for_versions_table
*/
private static $indexes_for_versions_table = array(
'RecordID_Version' => '("RecordID","Version")',
'RecordID' => true,
'Version' => true,
'AuthorID' => true,
'PublisherID' => true,
);
/**
* An array of DataObject extensions that may require versioning for extra tables
* The array value is a set of suffixes to form these table names, assuming a preceding '_'.
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* E.g. if Extension1 creates a new table 'Class_suffix1'
* and Extension2 the tables 'Class_suffix2' and 'Class_suffix3':
*
* $versionableExtensions = array(
* 'Extension1' => 'suffix1',
* 'Extension2' => array('suffix2', 'suffix3'),
* );
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*
* Make sure your extension has a static $enabled-property that determines if it is
* processed by Versioned.
*
* @var array
*/
protected static $versionableExtensions = array('Translatable' => 'lang');
/**
* Permissions necessary to view records outside of the live stage (e.g. archive / draft stage).
*
* @config
* @var array
*/
private static $non_live_permissions = array('CMS_ACCESS_LeftAndMain', 'CMS_ACCESS_CMSMain', 'VIEW_DRAFT_CONTENT');
/**
* Reset static configuration variables to their default values.
*/
public static function reset() {
self::$reading_mode = '';
Session::clear('readingMode');
}
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/**
* Construct a new Versioned object.
*
* @var array $stages The different stages the versioned object can be.
* The first stage is considered the 'default' stage, the last stage is
* considered the 'live' stage.
*/
public function __construct($stages = array('Stage','Live')) {
parent::__construct();
if(!is_array($stages)) {
$stages = func_get_args();
}
$this->stages = $stages;
$this->defaultStage = reset($stages);
$this->liveStage = array_pop($stages);
}
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/**
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* Amend freshly created DataQuery objects with versioned-specific
* information.
*
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* @param SQLQuery
* @param DataQuery
*/
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public function augmentDataQueryCreation(SQLQuery &$query, DataQuery &$dataQuery) {
$parts = explode('.', Versioned::get_reading_mode());
if($parts[0] == 'Archive') {
$dataQuery->setQueryParam('Versioned.mode', 'archive');
$dataQuery->setQueryParam('Versioned.date', $parts[1]);
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} else if($parts[0] == 'Stage' && $parts[1] != $this->defaultStage
&& array_search($parts[1],$this->stages) !== false) {
$dataQuery->setQueryParam('Versioned.mode', 'stage');
$dataQuery->setQueryParam('Versioned.stage', $parts[1]);
}
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}
/**
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* Augment the the SQLQuery that is created by the DataQuery
* @todo Should this all go into VersionedDataQuery?
*/
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public function augmentSQL(SQLQuery &$query, DataQuery &$dataQuery = null) {
if(!$dataQuery || !$dataQuery->getQueryParam('Versioned.mode')) {
return;
}
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$baseTable = ClassInfo::baseDataClass($dataQuery->dataClass());
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switch($dataQuery->getQueryParam('Versioned.mode')) {
// Reading a specific data from the archive
case 'archive':
$date = $dataQuery->getQueryParam('Versioned.date');
foreach($query->getFrom() as $table => $dummy) {
if(!DB::get_schema()->hasTable($table . '_versions')) {
continue;
}
$query->renameTable($table, $table . '_versions');
$query->replaceText("\"{$table}_versions\".\"ID\"", "\"{$table}_versions\".\"RecordID\"");
$query->replaceText("`{$table}_versions`.`ID`", "`{$table}_versions`.`RecordID`");
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// Add all <basetable>_versions columns
foreach(Config::inst()->get('Versioned', 'db_for_versions_table') as $name => $type) {
$query->selectField(sprintf('"%s_versions"."%s"', $baseTable, $name), $name);
}
$query->selectField(sprintf('"%s_versions"."%s"', $baseTable, 'RecordID'), "ID");
if($table != $baseTable) {
$query->addWhere("\"{$table}_versions\".\"Version\" = \"{$baseTable}_versions\".\"Version\"");
}
}
// Link to the version archived on that date
$query->addWhere(array(
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"\"{$baseTable}_versions\".\"Version\" IN
(SELECT LatestVersion FROM
(SELECT
\"{$baseTable}_versions\".\"RecordID\",
MAX(\"{$baseTable}_versions\".\"Version\") AS LatestVersion
FROM \"{$baseTable}_versions\"
WHERE \"{$baseTable}_versions\".\"LastEdited\" <= ?
GROUP BY \"{$baseTable}_versions\".\"RecordID\"
) AS \"{$baseTable}_versions_latest\"
WHERE \"{$baseTable}_versions_latest\".\"RecordID\" = \"{$baseTable}_versions\".\"RecordID\"
)" => $date
));
break;
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// Reading a specific stage (Stage or Live)
case 'stage':
$stage = $dataQuery->getQueryParam('Versioned.stage');
if($stage && ($stage != $this->defaultStage)) {
foreach($query->getFrom() as $table => $dummy) {
// Only rewrite table names that are actually part of the subclass tree
// This helps prevent rewriting of other tables that get joined in, in
// particular, many_many tables
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if(class_exists($table) && ($table == $this->owner->class
|| is_subclass_of($table, $this->owner->class)
|| is_subclass_of($this->owner->class, $table))) {
$query->renameTable($table, $table . '_' . $stage);
}
}
}
break;
// Reading a specific stage, but only return items that aren't in any other stage
case 'stage_unique':
$stage = $dataQuery->getQueryParam('Versioned.stage');
// Recurse to do the default stage behavior (must be first, we rely on stage renaming happening before
// below)
$dataQuery->setQueryParam('Versioned.mode', 'stage');
$this->augmentSQL($query, $dataQuery);
$dataQuery->setQueryParam('Versioned.mode', 'stage_unique');
// Now exclude any ID from any other stage. Note that we double rename to avoid the regular stage rename
// renaming all subquery references to be Versioned.stage
foreach($this->stages as $excluding) {
if ($excluding == $stage) continue;
$tempName = 'ExclusionarySource_'.$excluding;
$excludingTable = $baseTable . ($excluding && $excluding != $this->defaultStage ? "_$excluding" : '');
$query->addWhere('"'.$baseTable.'"."ID" NOT IN (SELECT "ID" FROM "'.$tempName.'")');
$query->renameTable($tempName, $excludingTable);
}
break;
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// Return all version instances
case 'all_versions':
case 'latest_versions':
foreach($query->getFrom() as $alias => $join) {
if($alias != $baseTable) {
$query->setJoinFilter($alias, "\"$alias\".\"RecordID\" = \"{$baseTable}_versions\".\"RecordID\""
. " AND \"$alias\".\"Version\" = \"{$baseTable}_versions\".\"Version\"");
}
$query->renameTable($alias, $alias . '_versions');
}
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// Add all <basetable>_versions columns
foreach(Config::inst()->get('Versioned', 'db_for_versions_table') as $name => $type) {
$query->selectField(sprintf('"%s_versions"."%s"', $baseTable, $name), $name);
}
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// Alias the record ID as the row ID
$query->selectField(sprintf('"%s_versions"."%s"', $baseTable, 'RecordID'), "ID");
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// Ensure that any sort order referring to this ID is correctly aliased
$orders = $query->getOrderBy();
foreach($orders as $order => $dir) {
if($order === "\"$baseTable\".\"ID\"") {
unset($orders[$order]);
$orders["\"{$baseTable}_versions\".\"RecordID\""] = $dir;
}
}
$query->setOrderBy($orders);
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// latest_version has one more step
// Return latest version instances, regardless of whether they are on a particular stage
// This provides "show all, including deleted" functonality
if($dataQuery->getQueryParam('Versioned.mode') == 'latest_versions') {
$query->addWhere(
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"\"{$alias}_versions\".\"Version\" IN
(SELECT LatestVersion FROM
(SELECT
\"{$alias}_versions\".\"RecordID\",
MAX(\"{$alias}_versions\".\"Version\") AS LatestVersion
FROM \"{$alias}_versions\"
GROUP BY \"{$alias}_versions\".\"RecordID\"
) AS \"{$alias}_versions_latest\"
WHERE \"{$alias}_versions_latest\".\"RecordID\" = \"{$alias}_versions\".\"RecordID\"
)");
} else {
// If all versions are requested, ensure that records are sorted by this field
$query->addOrderBy(sprintf('"%s_versions"."%s"', $baseTable, 'Version'));
}
break;
default:
throw new InvalidArgumentException("Bad value for query parameter Versioned.mode: "
. $dataQuery->getQueryParam('Versioned.mode'));
}
}
/**
* For lazy loaded fields requiring extra sql manipulation, ie versioning.
*
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* @param SQLQuery $query
* @param DataQuery $dataQuery
* @param DataObject $dataObject
*/
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public function augmentLoadLazyFields(SQLQuery &$query, DataQuery &$dataQuery = null, $dataObject) {
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// The VersionedMode local variable ensures that this decorator only applies to
// queries that have originated from the Versioned object, and have the Versioned
// metadata set on the query object. This prevents regular queries from
// accidentally querying the *_versions tables.
$versionedMode = $dataObject->getSourceQueryParam('Versioned.mode');
$dataClass = $dataQuery->dataClass();
$modesToAllowVersioning = array('all_versions', 'latest_versions', 'archive');
if(
!empty($dataObject->Version) &&
(!empty($versionedMode) && in_array($versionedMode,$modesToAllowVersioning))
) {
$dataQuery->where("\"$dataClass\".\"RecordID\" = " . $dataObject->ID);
$dataQuery->where("\"$dataClass\".\"Version\" = " . $dataObject->Version);
$dataQuery->setQueryParam('Versioned.mode', 'all_versions');
} else {
// Same behaviour as in DataObject->loadLazyFields
$dataQuery->where("\"$dataClass\".\"ID\" = {$dataObject->ID}")->limit(1);
}
}
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/**
* Called by {@link SapphireTest} when the database is reset.
*
* @todo Reduce the coupling between this and SapphireTest, somehow.
*/
public static function on_db_reset() {
// Drop all temporary tables
$db = DB::get_conn();
foreach(self::$archive_tables as $tableName) {
if(method_exists($db, 'dropTable')) $db->dropTable($tableName);
else $db->query("DROP TABLE \"$tableName\"");
}
// Remove references to them
self::$archive_tables = array();
}
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public function augmentDatabase() {
$classTable = $this->owner->class;
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$isRootClass = ($this->owner->class == ClassInfo::baseDataClass($this->owner->class));
// Build a list of suffixes whose tables need versioning
$allSuffixes = array();
foreach (Versioned::$versionableExtensions as $versionableExtension => $suffixes) {
if ($this->owner->hasExtension($versionableExtension)) {
$allSuffixes = array_merge($allSuffixes, (array)$suffixes);
foreach ((array)$suffixes as $suffix) {
$allSuffixes[$suffix] = $versionableExtension;
}
}
}
// Add the default table with an empty suffix to the list (table name = class name)
array_push($allSuffixes,'');
foreach ($allSuffixes as $key => $suffix) {
// check that this is a valid suffix
if (!is_int($key)) continue;
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if ($suffix) $table = "{$classTable}_$suffix";
else $table = $classTable;
if($fields = DataObject::database_fields($this->owner->class)) {
$options = Config::inst()->get($this->owner->class, 'create_table_options', Config::FIRST_SET);
$indexes = $this->owner->databaseIndexes();
if ($suffix && ($ext = $this->owner->getExtensionInstance($allSuffixes[$suffix]))) {
if (!$ext->isVersionedTable($table)) continue;
$ext->setOwner($this->owner);
$fields = $ext->fieldsInExtraTables($suffix);
$ext->clearOwner();
$indexes = $fields['indexes'];
$fields = $fields['db'];
}
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// Create tables for other stages
foreach($this->stages as $stage) {
// Extra tables for _Live, etc.
// Change unique indexes to 'index'. Versioned tables may run into unique indexing difficulties
// otherwise.
$indexes = $this->uniqueToIndex($indexes);
if($stage != $this->defaultStage) {
DB::require_table("{$table}_$stage", $fields, $indexes, false, $options);
}
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// Version fields on each root table (including Stage)
/*
if($isRootClass) {
$stageTable = ($stage == $this->defaultStage) ? $table : "{$table}_$stage";
$parts=Array('datatype'=>'int', 'precision'=>11, 'null'=>'not null', 'default'=>(int)0);
$values=Array('type'=>'int', 'parts'=>$parts);
DB::requireField($stageTable, 'Version', $values);
}
*/
}
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if($isRootClass) {
// Create table for all versions
$versionFields = array_merge(
Config::inst()->get('Versioned', 'db_for_versions_table'),
(array)$fields
);
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$versionIndexes = array_merge(
Config::inst()->get('Versioned', 'indexes_for_versions_table'),
(array)$indexes
);
} else {
// Create fields for any tables of subclasses
$versionFields = array_merge(
array(
"RecordID" => "Int",
"Version" => "Int",
),
(array)$fields
);
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//Unique indexes will not work on versioned tables, so we'll convert them to standard indexes:
$indexes = $this->uniqueToIndex($indexes);
$versionIndexes = array_merge(
array(
'RecordID_Version' => array('type' => 'unique', 'value' => '"RecordID","Version"'),
'RecordID' => true,
'Version' => true,
),
(array)$indexes
);
}
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if(DB::get_schema()->hasTable("{$table}_versions")) {
// Fix data that lacks the uniqueness constraint (since this was added later and
// bugs meant that the constraint was validated)
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$duplications = DB::query("SELECT MIN(\"ID\") AS \"ID\", \"RecordID\", \"Version\"
FROM \"{$table}_versions\" GROUP BY \"RecordID\", \"Version\"
HAVING COUNT(*) > 1");
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foreach($duplications as $dup) {
DB::alteration_message("Removing {$table}_versions duplicate data for "
."{$dup['RecordID']}/{$dup['Version']}" ,"deleted");
DB::prepared_query(
"DELETE FROM \"{$table}_versions\" WHERE \"RecordID\" = ?
AND \"Version\" = ? AND \"ID\" != ?",
array($dup['RecordID'], $dup['Version'], $dup['ID'])
);
}
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// Remove junk which has no data in parent classes. Only needs to run the following
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// when versioned data is spread over multiple tables
if(!$isRootClass && ($versionedTables = ClassInfo::dataClassesFor($table))) {
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foreach($versionedTables as $child) {
if($table === $child) break; // only need subclasses
// Select all orphaned version records
$orphanedQuery = SQLSelect::create()
->selectField("\"{$table}_versions\".\"ID\"")
->setFrom("\"{$table}_versions\"");
// If we have a parent table limit orphaned records
// to only those that exist in this
if(DB::get_schema()->hasTable("{$child}_versions")) {
$orphanedQuery
->addLeftJoin(
"{$child}_versions",
"\"{$child}_versions\".\"RecordID\" = \"{$table}_versions\".\"RecordID\"
AND \"{$child}_versions\".\"Version\" = \"{$table}_versions\".\"Version\""
)
->addWhere("\"{$child}_versions\".\"ID\" IS NULL");
}
$count = $orphanedQuery->count();
if($count > 0) {
DB::alteration_message("Removing {$count} orphaned versioned records", "deleted");
$ids = $orphanedQuery->execute()->column();
foreach($ids as $id) {
DB::prepared_query(
"DELETE FROM \"{$table}_versions\" WHERE \"ID\" = ?",
array($id)
);
}
}
}
}
}
DB::require_table("{$table}_versions", $versionFields, $versionIndexes, true, $options);
} else {
DB::dont_require_table("{$table}_versions");
foreach($this->stages as $stage) {
if($stage != $this->defaultStage) DB::dont_require_table("{$table}_$stage");
}
}
}
}
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/**
* Helper for augmentDatabase() to find unique indexes and convert them to non-unique
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*
* @param array $indexes The indexes to convert
* @return array $indexes
*/
private function uniqueToIndex($indexes) {
$unique_regex = '/unique/i';
$results = array();
foreach ($indexes as $key => $index) {
$results[$key] = $index;
// support string descriptors
if (is_string($index)) {
if (preg_match($unique_regex, $index)) {
$results[$key] = preg_replace($unique_regex, 'index', $index);
}
}
// canonical, array-based descriptors
elseif (is_array($index)) {
if (strtolower($index['type']) == 'unique') {
$results[$key]['type'] = 'index';
}
}
}
return $results;
}
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/**
* Generates a ($table)_version DB manipulation and injects it into the current $manipulation
*
* @param array $manipulation Source manipulation data
* @param string $table Name of table
* @param int $recordID ID of record to version
*/
protected function augmentWriteVersioned(&$manipulation, $table, $recordID) {
$baseDataClass = ClassInfo::baseDataClass($table);
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// Set up a new entry in (table)_versions
$newManipulation = array(
"command" => "insert",
"fields" => isset($manipulation[$table]['fields']) ? $manipulation[$table]['fields'] : null
);
// Add any extra, unchanged fields to the version record.
$data = DB::prepared_query("SELECT * FROM \"$table\" WHERE \"ID\" = ?", array($recordID))->record();
if ($data) {
$fields = DataObject::database_fields($table);
if (is_array($fields)) {
$data = array_intersect_key($data, $fields);
foreach ($data as $k => $v) {
if (!isset($newManipulation['fields'][$k])) {
$newManipulation['fields'][$k] = $v;
}
}
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}
}
// Ensure that the ID is instead written to the RecordID field
$newManipulation['fields']['RecordID'] = $recordID;
unset($newManipulation['fields']['ID']);
// Generate next version ID to use
$nextVersion = 0;
if($recordID) {
$nextVersion = DB::prepared_query("SELECT MAX(\"Version\") + 1
FROM \"{$baseDataClass}_versions\" WHERE \"RecordID\" = ?",
array($recordID)
)->value();
}
$nextVersion = $nextVersion ?: 1;
if($table === $baseDataClass) {
// Write AuthorID for baseclass
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$userID = (Member::currentUser()) ? Member::currentUser()->ID : 0;
$newManipulation['fields']['AuthorID'] = $userID;
// Update main table version if not previously known
$manipulation[$table]['fields']['Version'] = $nextVersion;
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}
// Update _versions table manipulation
$newManipulation['fields']['Version'] = $nextVersion;
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$manipulation["{$table}_versions"] = $newManipulation;
}
/**
* Rewrite the given manipulation to update the selected (non-default) stage
*
* @param array $manipulation Source manipulation data
* @param string $table Name of table
* @param int $recordID ID of record to version
*/
protected function augmentWriteStaged(&$manipulation, $table, $recordID) {
// If the record has already been inserted in the (table), get rid of it.
if($manipulation[$table]['command'] == 'insert') {
DB::prepared_query(
"DELETE FROM \"{$table}\" WHERE \"ID\" = ?",
array($recordID)
);
}
$newTable = $table . '_' . Versioned::current_stage();
$manipulation[$newTable] = $manipulation[$table];
unset($manipulation[$table]);
}
public function augmentWrite(&$manipulation) {
// get Version number from base data table on write
$version = null;
$baseDataClass = ClassInfo::baseDataClass($this->owner->class);
if(isset($manipulation[$baseDataClass]['fields'])) {
if ($this->migratingVersion) {
$manipulation[$baseDataClass]['fields']['Version'] = $this->migratingVersion;
}
if (isset($manipulation[$baseDataClass]['fields']['Version'])) {
$version = $manipulation[$baseDataClass]['fields']['Version'];
}
}
// Update all tables
$tables = array_keys($manipulation);
foreach($tables as $table) {
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// Make sure that the augmented write is being applied to a table that can be versioned
if( !$this->canBeVersioned($table) ) {
unset($manipulation[$table]);
continue;
}
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// Get ID field
$id = $manipulation[$table]['id']
? $manipulation[$table]['id']
: $manipulation[$table]['fields']['ID'];
if(!$id) {
user_error("Couldn't find ID in " . var_export($manipulation[$table], true), E_USER_ERROR);
}
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if($version < 0 || $this->_nextWriteWithoutVersion) {
// Putting a Version of -1 is a signal to leave the version table alone, despite their being no version
unset($manipulation[$table]['fields']['Version']);
} elseif(empty($version)) {
// If we haven't got a version #, then we're creating a new version.
// Otherwise, we're just copying a version to another table
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$this->augmentWriteVersioned($manipulation, $table, $id);
}
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// Remove "Version" column from subclasses of baseDataClass
if(!$this->hasVersionField($table)) {
unset($manipulation[$table]['fields']['Version']);
}
// Grab a version number - it should be the same across all tables.
if(isset($manipulation[$table]['fields']['Version'])) {
$thisVersion = $manipulation[$table]['fields']['Version'];
}
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// If we're editing Live, then use (table)_Live instead of (table)
if(
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Versioned::current_stage()
&& Versioned::current_stage() != $this->defaultStage
&& in_array(Versioned::current_stage(), $this->stages)
) {
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$this->augmentWriteStaged($manipulation, $table, $id);
}
}
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// Clear the migration flag
if($this->migratingVersion) {
$this->migrateVersion(null);
}
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// Add the new version # back into the data object, for accessing
// after this write
if(isset($thisVersion)) {
$this->owner->Version = str_replace("'","", $thisVersion);
}
}
/**
* Perform a write without affecting the version table.
* On objects without versioning.
*
* @return int The ID of the record
*/
public function writeWithoutVersion() {
$this->_nextWriteWithoutVersion = true;
return $this->owner->write();
}
/**
*
*/
public function onAfterWrite() {
$this->_nextWriteWithoutVersion = false;
}
/**
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* If a write was skipped, then we need to ensure that we don't leave a
* migrateVersion() value lying around for the next write.
*
*
*/
public function onAfterSkippedWrite() {
$this->migrateVersion(null);
}
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/**
* Extend permissions to include additional security for objects that are not published to live.
*
* @param Member $member
* @return bool|null
*/
public function canView($member = null) {
// Invoke default version-gnostic canView
if ($this->owner->canViewVersioned($member) === false) {
return false;
}
}
/**
* Determine if there are any additional restrictions on this object for the given reading version.
*
* Override this in a subclass to customise any additional effect that Versioned applies to canView.
*
* This is expected to be called by canView, and thus is only responsible for denying access if
* the default canView would otherwise ALLOW access. Thus it should not be called in isolation
* as an authoritative permission check.
*
* This has the following extension points:
* - canViewDraft is invoked if Mode = stage and Stage = stage
* - canViewArchived is invoked if Mode = archive
*
* @param Member $member
* @return bool False is returned if the current viewing mode denies visibility
*/
public function canViewVersioned($member = null) {
// Bypass when live stage
$mode = $this->owner->getSourceQueryParam("Versioned.mode");
$stage = $this->owner->getSourceQueryParam("Versioned.stage");
if ($mode === 'stage' && $stage === static::get_live_stage()) {
return true;
}
// Bypass if site is unsecured
if (Session::get('unsecuredDraftSite')) {
return true;
}
// If we weren't definitely loaded from live, and we can't view non-live content, we need to
// check to make sure this version is the live version and so can be viewed
$latestVersion = Versioned::get_versionnumber_by_stage($this->owner->class, 'Live', $this->owner->ID);
if ($latestVersion == $this->owner->Version) {
// Even if this is loaded from a non-live stage, this is the live version
return true;
}
// Extend versioned behaviour
$extended = $this->owner->extendedCan('canViewNonLive', $member);
if($extended !== null) {
return (bool)$extended;
}
// Fall back to default permission check
$permissions = Config::inst()->get($this->owner->class, 'non_live_permissions', Config::FIRST_SET);
$check = Permission::checkMember($member, $permissions);
return (bool)$check;
}
/**
* Determines canView permissions for the latest version of this object on a specific stage.
* Usually the stage is read from {@link Versioned::current_stage()}.
*
* This method should be invoked by user code to check if a record is visible in the given stage.
*
* This method should not be called via ->extend('canViewStage'), but rather should be
* overridden in the extended class.
*
* @param string $stage
* @param Member $member
* @return bool
*/
public function canViewStage($stage = 'Live', $member = null) {
$oldMode = Versioned::get_reading_mode();
Versioned::reading_stage($stage);
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$versionFromStage = DataObject::get($this->owner->class)->byID($this->owner->ID);
Versioned::set_reading_mode($oldMode);
return $versionFromStage ? $versionFromStage->canView($member) : false;
}
/**
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* Determine if a table is supporting the Versioned extensions (e.g.
* $table_versions does exists).
*
* @param string $table Table name
* @return boolean
*/
public function canBeVersioned($table) {
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return ClassInfo::exists($table)
&& is_subclass_of($table, 'DataObject')
&& DataObject::has_own_table($table);
}
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/**
* Check if a certain table has the 'Version' field.
*
* @param string $table Table name
*
* @return boolean Returns false if the field isn't in the table, true otherwise
*/
public function hasVersionField($table) {
$rPos = strrpos($table,'_');
if(($rPos !== false) && in_array(substr($table,$rPos), $this->stages)) {
$tableWithoutStage = substr($table,0,$rPos);
} else {
$tableWithoutStage = $table;
}
return ('DataObject' == get_parent_class($tableWithoutStage));
}
/**
* @param string $table
*
* @return string
*/
public function extendWithSuffix($table) {
foreach (Versioned::$versionableExtensions as $versionableExtension => $suffixes) {
if ($this->owner->hasExtension($versionableExtension)) {
$ext = $this->owner->getExtensionInstance($versionableExtension);
$ext->setOwner($this->owner);
$table = $ext->extendWithSuffix($table);
$ext->clearOwner();
}
}
return $table;
}
/**
* Get the latest published DataObject.
*
* @return DataObject
*/
public function latestPublished() {
// Get the root data object class - this will have the version field
$table1 = $this->owner->class;
while( ($p = get_parent_class($table1)) != "DataObject") $table1 = $p;
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$table2 = $table1 . "_$this->liveStage";
return DB::prepared_query("SELECT \"$table1\".\"Version\" = \"$table2\".\"Version\" FROM \"$table1\"
INNER JOIN \"$table2\" ON \"$table1\".\"ID\" = \"$table2\".\"ID\"
WHERE \"$table1\".\"ID\" = ?",
array($this->owner->ID)
)->value();
}
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/**
* Move a database record from one stage to the other.
*
* @param int|string $fromStage Place to copy from. Can be either a stage name or a version number.
* @param string $toStage Place to copy to. Must be a stage name.
* @param bool $createNewVersion Set this to true to create a new version number.
* By default, the existing version number will be copied over.
*/
public function publish($fromStage, $toStage, $createNewVersion = false) {
$this->owner->extend('onBeforeVersionedPublish', $fromStage, $toStage, $createNewVersion);
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$baseClass = ClassInfo::baseDataClass($this->owner->class);
$extTable = $this->extendWithSuffix($baseClass);
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/** @var Versioned|DataObject $from */
if(is_numeric($fromStage)) {
$from = Versioned::get_version($baseClass, $this->owner->ID, $fromStage);
} else {
$this->owner->flushCache();
$from = Versioned::get_one_by_stage($baseClass, $fromStage, array(
"\"{$baseClass}\".\"ID\" = ?" => $this->owner->ID
));
}
if(!$from) {
user_error("Can't find {$this->owner->class}/{$this->owner->ID} in stage {$fromStage}", E_USER_WARNING);
return;
}
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// Set version of new record
$from->forceChange();
if($createNewVersion) {
// Clear version to be automatically created on write
$from->Version = null;
} else {
$from->migrateVersion($from->Version);
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// Mark this version as having been published at some stage
$publisherID = isset(Member::currentUser()->ID) ? Member::currentUser()->ID : 0;
DB::prepared_query("UPDATE \"{$extTable}_versions\"
SET \"WasPublished\" = ?, \"PublisherID\" = ?
WHERE \"RecordID\" = ? AND \"Version\" = ?",
array(1, $publisherID, $from->ID, $from->Version)
);
}
// Change to new stage, write, and revert state
$oldMode = Versioned::get_reading_mode();
Versioned::reading_stage($toStage);
$conn = DB::get_conn();
if(method_exists($conn, 'allowPrimaryKeyEditing')) {
$conn->allowPrimaryKeyEditing($baseClass, true);
$from->write();
$conn->allowPrimaryKeyEditing($baseClass, false);
} else {
$from->write();
}
$from->destroy();
Versioned::set_reading_mode($oldMode);
}
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/**
* Set the migrating version.
*
* @param string $version The version.
*/
public function migrateVersion($version) {
$this->migratingVersion = $version;
}
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/**
* Compare two stages to see if they're different.
*
* Only checks the version numbers, not the actual content.
*
* @param string $stage1 The first stage to check.
* @param string $stage2
*/
public function stagesDiffer($stage1, $stage2) {
$table1 = $this->baseTable($stage1);
$table2 = $this->baseTable($stage2);
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if(!is_numeric($this->owner->ID)) {
return true;
}
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// We test for equality - if one of the versions doesn't exist, this
// will be false.
// TODO: DB Abstraction: if statement here:
$stagesAreEqual = DB::prepared_query(
"SELECT CASE WHEN \"$table1\".\"Version\"=\"$table2\".\"Version\" THEN 1 ELSE 0 END
FROM \"$table1\" INNER JOIN \"$table2\" ON \"$table1\".\"ID\" = \"$table2\".\"ID\"
AND \"$table1\".\"ID\" = ?",
array($this->owner->ID)
)->value();
return !$stagesAreEqual;
}
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/**
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* @param string $filter
* @param string $sort
* @param string $limit
* @param string $join Deprecated, use leftJoin($table, $joinClause) instead
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* @param string $having
*/
public function Versions($filter = "", $sort = "", $limit = "", $join = "", $having = "") {
return $this->allVersions($filter, $sort, $limit, $join, $having);
}
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/**
* Return a list of all the versions available.
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*
* @param string $filter
* @param string $sort
* @param string $limit
* @param string $join Deprecated, use leftJoin($table, $joinClause) instead
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* @param string $having
*/
public function allVersions($filter = "", $sort = "", $limit = "", $join = "", $having = "") {
// Make sure the table names are not postfixed (e.g. _Live)
$oldMode = self::get_reading_mode();
self::reading_stage('Stage');
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$list = DataObject::get(get_class($this->owner), $filter, $sort, $join, $limit);
if($having) $having = $list->having($having);
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$query = $list->dataQuery()->query();
foreach($query->getFrom() as $table => $tableJoin) {
if(is_string($tableJoin) && $tableJoin[0] == '"') {
$baseTable = str_replace('"','',$tableJoin);
} elseif(is_string($tableJoin) && substr($tableJoin,0,5) != 'INNER') {
$query->setFrom(array(
$table => "LEFT JOIN \"$table\" ON \"$table\".\"RecordID\"=\"{$baseTable}_versions\".\"RecordID\""
. " AND \"$table\".\"Version\" = \"{$baseTable}_versions\".\"Version\""
));
}
$query->renameTable($table, $table . '_versions');
}
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// Add all <basetable>_versions columns
foreach(Config::inst()->get('Versioned', 'db_for_versions_table') as $name => $type) {
$query->selectField(sprintf('"%s_versions"."%s"', $baseTable, $name), $name);
}
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$query->addWhere(array(
"\"{$baseTable}_versions\".\"RecordID\" = ?" => $this->owner->ID
));
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$query->setOrderBy(($sort) ? $sort
: "\"{$baseTable}_versions\".\"LastEdited\" DESC, \"{$baseTable}_versions\".\"Version\" DESC");
$records = $query->execute();
$versions = new ArrayList();
foreach($records as $record) {
$versions->push(new Versioned_Version($record));
}
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Versioned::set_reading_mode($oldMode);
return $versions;
}
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/**
* Compare two version, and return the diff between them.
*
* @param string $from The version to compare from.
* @param string $to The version to compare to.
*
* @return DataObject
*/
public function compareVersions($from, $to) {
$fromRecord = Versioned::get_version($this->owner->class, $this->owner->ID, $from);
$toRecord = Versioned::get_version($this->owner->class, $this->owner->ID, $to);
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$diff = new DataDifferencer($fromRecord, $toRecord);
return $diff->diffedData();
}
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/**
* Return the base table - the class that directly extends DataObject.
*
* @return string
*/
public function baseTable($stage = null) {
$tableClasses = ClassInfo::dataClassesFor($this->owner->class);
$baseClass = array_shift($tableClasses);
if(!$stage || $stage == $this->defaultStage) {
return $baseClass;
}
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return $baseClass . "_$stage";
}
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//-----------------------------------------------------------------------------------------------//
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/**
* Determine if the current user is able to set the given site stage / archive
*
* @param SS_HTTPRequest $request
* @return bool
*/
public static function can_choose_site_stage($request) {
// Request is allowed if stage isn't being modified
if((!$request->getVar('stage') || $request->getVar('stage') === static::get_live_stage())
&& !$request->getVar('archiveDate')
) {
return true;
}
// Check permissions with member ID in session.
$member = Member::currentUser();
$permissions = Config::inst()->get(get_called_class(), 'non_live_permissions');
return $member && Permission::checkMember($member, $permissions);
}
/**
* Choose the stage the site is currently on.
*
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* If $_GET['stage'] is set, then it will use that stage, and store it in
* the session.
*
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* if $_GET['archiveDate'] is set, it will use that date, and store it in
* the session.
*
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* If neither of these are set, it checks the session, otherwise the stage
* is set to 'Live'.
*/
public static function choose_site_stage() {
// Check any pre-existing session mode
$preexistingMode = Session::get('readingMode');
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// Determine the reading mode
if(isset($_GET['stage'])) {
$stage = ucfirst(strtolower($_GET['stage']));
if(!in_array($stage, array('Stage', 'Live'))) $stage = 'Live';
$mode = 'Stage.' . $stage;
} elseif (isset($_GET['archiveDate']) && strtotime($_GET['archiveDate'])) {
$mode = 'Archive.' . $_GET['archiveDate'];
} elseif($preexistingMode) {
$mode = $preexistingMode;
} else {
$mode = self::DEFAULT_MODE;
}
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// Save reading mode
Versioned::set_reading_mode($mode);
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// Try not to store the mode in the session if not needed
if(($preexistingMode && $preexistingMode !== $mode)
|| (!$preexistingMode && $mode !== self::DEFAULT_MODE)
) {
Session::set('readingMode', $mode);
}
if(!headers_sent() && !Director::is_cli()) {
if(Versioned::current_stage() == 'Live') {
// clear the cookie if it's set
NEW Cookie_Backend for managing cookie state I've decoupled `Cookie` from the actual act of setting and getting cookies. Currently there are a few limitations to how Cookie works that this change mitigates: 0. `Cookie` currently changes the super global `$_COOKIE` when setting to make the state of an application a bit more managable, but this is bad because we shouldn't be modifying super globals 0. One can't actually change the `$cookie_class` once the `Cookie::$inst` has been instantiated 0. One can't test cookies as there is no class that holds the state of the cookies (it's just held in the super global which is reset as part of `Director::test()` 0. One can't tell the origin of a cookie (eg: did the application set it and it needs to be sent, or did we receive it from the browser?) 0. `time()` was used, so testing was made difficult 0. There was no way to get all the cookies at once (without accessing the super global) Todos are on the phpdoc and I'd like to write some tests for the backend as well as update the docs (if there are any) around cookies. DOCS Adding `Cookie` docs Explains basic usage of `Cookie` as well as how the `Cookie_Backend` controls the setting and getting of cookies and manages state of sent vs received cookies Fixing `Cookie` usage `Cookie` is being used inconsistently with the API throughout framework. Either by not using `force_expiry` to expire cookies or setting them to null and then expiring them (which is redundant). NEW `Director::test()` takes `Cookie_Backend` rather than `array` for `$cookies` param
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if(Cookie::get('bypassStaticCache')) {
Cookie::force_expiry('bypassStaticCache', null, null, false, true /* httponly */);
}
} else {
// set the cookie if it's cleared
NEW Cookie_Backend for managing cookie state I've decoupled `Cookie` from the actual act of setting and getting cookies. Currently there are a few limitations to how Cookie works that this change mitigates: 0. `Cookie` currently changes the super global `$_COOKIE` when setting to make the state of an application a bit more managable, but this is bad because we shouldn't be modifying super globals 0. One can't actually change the `$cookie_class` once the `Cookie::$inst` has been instantiated 0. One can't test cookies as there is no class that holds the state of the cookies (it's just held in the super global which is reset as part of `Director::test()` 0. One can't tell the origin of a cookie (eg: did the application set it and it needs to be sent, or did we receive it from the browser?) 0. `time()` was used, so testing was made difficult 0. There was no way to get all the cookies at once (without accessing the super global) Todos are on the phpdoc and I'd like to write some tests for the backend as well as update the docs (if there are any) around cookies. DOCS Adding `Cookie` docs Explains basic usage of `Cookie` as well as how the `Cookie_Backend` controls the setting and getting of cookies and manages state of sent vs received cookies Fixing `Cookie` usage `Cookie` is being used inconsistently with the API throughout framework. Either by not using `force_expiry` to expire cookies or setting them to null and then expiring them (which is redundant). NEW `Director::test()` takes `Cookie_Backend` rather than `array` for `$cookies` param
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if(!Cookie::get('bypassStaticCache')) {
Cookie::set('bypassStaticCache', '1', 0, null, null, false, true /* httponly */);
}
}
}
}
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/**
* Set the current reading mode.
*
* @param string $mode
*/
public static function set_reading_mode($mode) {
Versioned::$reading_mode = $mode;
}
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/**
* Get the current reading mode.
*
* @return string
*/
public static function get_reading_mode() {
return Versioned::$reading_mode;
}
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/**
* Get the name of the 'live' stage.
*
* @return string
*/
public static function get_live_stage() {
return "Live";
}
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/**
* Get the current reading stage.
*
* @return string
*/
public static function current_stage() {
$parts = explode('.', Versioned::get_reading_mode());
if($parts[0] == 'Stage') {
return $parts[1];
}
}
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/**
* Get the current archive date.
*
* @return string
*/
public static function current_archived_date() {
$parts = explode('.', Versioned::get_reading_mode());
if($parts[0] == 'Archive') return $parts[1];
}
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/**
* Set the reading stage.
*
* @param string $stage New reading stage.
*/
public static function reading_stage($stage) {
Versioned::set_reading_mode('Stage.' . $stage);
}
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/**
* Set the reading archive date.
*
* @param string $date New reading archived date.
*/
public static function reading_archived_date($date) {
Versioned::set_reading_mode('Archive.' . $date);
}
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/**
* Get a singleton instance of a class in the given stage.
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*
* @param string $class The name of the class.
* @param string $stage The name of the stage.
* @param string $filter A filter to be inserted into the WHERE clause.
* @param boolean $cache Use caching.
* @param string $orderby A sort expression to be inserted into the ORDER BY clause.
*
* @return DataObject
*/
public static function get_one_by_stage($class, $stage, $filter = '', $cache = true, $sort = '') {
// TODO: No identity cache operating
$items = self::get_by_stage($class, $stage, $filter, $sort, null, 1);
return $items->First();
}
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/**
* Gets the current version number of a specific record.
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*
* @param string $class
* @param string $stage
* @param int $id
* @param boolean $cache
*
* @return int
*/
public static function get_versionnumber_by_stage($class, $stage, $id, $cache = true) {
$baseClass = ClassInfo::baseDataClass($class);
$stageTable = ($stage == 'Stage') ? $baseClass : "{$baseClass}_{$stage}";
// cached call
if($cache && isset(self::$cache_versionnumber[$baseClass][$stage][$id])) {
return self::$cache_versionnumber[$baseClass][$stage][$id];
}
// get version as performance-optimized SQL query (gets called for each page in the sitetree)
$version = DB::prepared_query(
"SELECT \"Version\" FROM \"$stageTable\" WHERE \"ID\" = ?",
array($id)
)->value();
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// cache value (if required)
if($cache) {
if(!isset(self::$cache_versionnumber[$baseClass])) {
self::$cache_versionnumber[$baseClass] = array();
}
if(!isset(self::$cache_versionnumber[$baseClass][$stage])) {
self::$cache_versionnumber[$baseClass][$stage] = array();
}
self::$cache_versionnumber[$baseClass][$stage][$id] = $version;
}
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return $version;
}
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/**
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* Pre-populate the cache for Versioned::get_versionnumber_by_stage() for
* a list of record IDs, for more efficient database querying. If $idList
* is null, then every page will be pre-cached.
*
* @param string $class
* @param string $stage
* @param array $idList
*/
public static function prepopulate_versionnumber_cache($class, $stage, $idList = null) {
if (!Config::inst()->get('Versioned', 'prepopulate_versionnumber_cache')) {
return;
}
$filter = "";
$parameters = array();
if($idList) {
// Validate the ID list
foreach($idList as $id) {
if(!is_numeric($id)) {
user_error("Bad ID passed to Versioned::prepopulate_versionnumber_cache() in \$idList: " . $id,
E_USER_ERROR);
}
}
$filter = 'WHERE "ID" IN ('.DB::placeholders($idList).')';
$parameters = $idList;
}
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$baseClass = ClassInfo::baseDataClass($class);
$stageTable = ($stage == 'Stage') ? $baseClass : "{$baseClass}_{$stage}";
$versions = DB::prepared_query("SELECT \"ID\", \"Version\" FROM \"$stageTable\" $filter", $parameters)->map();
foreach($versions as $id => $version) {
self::$cache_versionnumber[$baseClass][$stage][$id] = $version;
}
}
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/**
* Get a set of class instances by the given stage.
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*
* @param string $class The name of the class.
* @param string $stage The name of the stage.
* @param string $filter A filter to be inserted into the WHERE clause.
* @param string $sort A sort expression to be inserted into the ORDER BY clause.
* @param string $join Deprecated, use leftJoin($table, $joinClause) instead
* @param int $limit A limit on the number of records returned from the database.
* @param string $containerClass The container class for the result set (default is DataList)
*
* @return DataList A modified DataList designated to the specified stage
*/
public static function get_by_stage($class, $stage, $filter = '', $sort = '', $join = '', $limit = '',
$containerClass = 'DataList') {
$result = DataObject::get($class, $filter, $sort, $join, $limit, $containerClass);
return $result->setDataQueryParam(array(
'Versioned.mode' => 'stage',
'Versioned.stage' => $stage
));
}
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/**
* @param string $stage
*
* @return int
*/
public function deleteFromStage($stage) {
$oldMode = Versioned::get_reading_mode();
Versioned::reading_stage($stage);
$clone = clone $this->owner;
$result = $clone->delete();
Versioned::set_reading_mode($oldMode);
// Fix the version number cache (in case you go delete from stage and then check ExistsOnLive)
$baseClass = ClassInfo::baseDataClass($this->owner->class);
self::$cache_versionnumber[$baseClass][$stage][$this->owner->ID] = null;
return $result;
}
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/**
* @param string $stage
* @param boolean $forceInsert
*/
public function writeToStage($stage, $forceInsert = false) {
$oldMode = Versioned::get_reading_mode();
Versioned::reading_stage($stage);
$this->owner->forceChange();
$result = $this->owner->write(false, $forceInsert);
Versioned::set_reading_mode($oldMode);
return $result;
}
/**
* Roll the draft version of this page to match the published page.
* Caution: Doesn't overwrite the object properties with the rolled back version.
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*
* @param int $version Either the string 'Live' or a version number
*/
public function doRollbackTo($version) {
$this->owner->extend('onBeforeRollback', $version);
$this->publish($version, "Stage", true);
$this->owner->writeWithoutVersion();
$this->owner->extend('onAfterRollback', $version);
}
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/**
* Return the latest version of the given page.
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*
* @return DataObject
*/
public static function get_latest_version($class, $id) {
$baseClass = ClassInfo::baseDataClass($class);
$list = DataList::create($baseClass)
->where("\"$baseClass\".\"RecordID\" = $id")
->setDataQueryParam("Versioned.mode", "latest_versions");
return $list->First();
}
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/**
* Returns whether the current record is the latest one.
*
* @todo Performance - could do this directly via SQL.
*
* @see get_latest_version()
* @see latestPublished
*
* @return boolean
*/
public function isLatestVersion() {
$version = self::get_latest_version($this->owner->class, $this->owner->ID);
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return ($version->Version == $this->owner->Version);
}
/**
* Return the equivalent of a DataList::create() call, querying the latest
* version of each page stored in the (class)_versions tables.
*
* In particular, this will query deleted records as well as active ones.
*
* @param string $class
* @param string $filter
* @param string $sort
*/
public static function get_including_deleted($class, $filter = "", $sort = "") {
$list = DataList::create($class)
->where($filter)
->sort($sort)
->setDataQueryParam("Versioned.mode", "latest_versions");
return $list;
}
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/**
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* Return the specific version of the given id.
*
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* Caution: The record is retrieved as a DataObject, but saving back
* modifications via write() will create a new version, rather than
* modifying the existing one.
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*
* @param string $class
* @param int $id
* @param int $version
*
* @return DataObject
*/
public static function get_version($class, $id, $version) {
$baseClass = ClassInfo::baseDataClass($class);
$list = DataList::create($baseClass)
->where("\"$baseClass\".\"RecordID\" = $id")
->where("\"$baseClass\".\"Version\" = " . (int)$version)
->setDataQueryParam("Versioned.mode", 'all_versions');
return $list->First();
}
/**
* Return a list of all versions for a given id.
*
* @param string $class
* @param int $id
*
* @return DataList
*/
public static function get_all_versions($class, $id) {
$baseClass = ClassInfo::baseDataClass($class);
$list = DataList::create($class)
->where("\"$baseClass\".\"RecordID\" = $id")
->setDataQueryParam('Versioned.mode', 'all_versions');
return $list;
}
/**
* @param array $labels
*/
public function updateFieldLabels(&$labels) {
$labels['Versions'] = _t('Versioned.has_many_Versions', 'Versions', 'Past Versions of this page');
}
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/**
* @param FieldList
*/
public function updateCMSFields(FieldList $fields) {
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// remove the version field from the CMS as this should be left
// entirely up to the extension (not the cms user).
$fields->removeByName('Version');
}
/**
* Ensure version ID is reset to 0 on duplicate
*
* @param DataObject $source Record this was duplicated from
* @param bool $doWrite
*/
public function onBeforeDuplicate($source, $doWrite) {
$this->owner->Version = 0;
}
public function flushCache() {
self::$cache_versionnumber = array();
}
/**
* Return a piece of text to keep DataObject cache keys appropriately specific.
*
* @return string
*/
public function cacheKeyComponent() {
return 'versionedmode-'.self::get_reading_mode();
}
/**
* Returns an array of possible stages.
*
* @return array
*/
public function getVersionedStages() {
return $this->stages;
}
/**
* @return string
*/
public function getDefaultStage() {
return $this->defaultStage;
}
public static function get_template_global_variables() {
return array(
'CurrentReadingMode' => 'get_reading_mode'
);
}
}
/**
* Represents a single version of a record.
*
* @package framework
* @subpackage model
*
* @see Versioned
*/
class Versioned_Version extends ViewableData {
/**
* @var array
*/
protected $record;
/**
* @var DataObject
*/
protected $object;
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public function __construct($record) {
$this->record = $record;
$record['ID'] = $record['RecordID'];
$className = $record['ClassName'];
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$this->object = ClassInfo::exists($className) ? new $className($record) : new DataObject($record);
$this->failover = $this->object;
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parent::__construct();
}
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/**
* @return string
*/
public function PublishedClass() {
return $this->record['WasPublished'] ? 'published' : 'internal';
}
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/**
* @return Member
*/
public function Author() {
return Member::get()->byId($this->record['AuthorID']);
}
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/**
* @return Member
*/
public function Publisher() {
if (!$this->record['WasPublished']) {
return null;
}
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return Member::get()->byId($this->record['PublisherID']);
}
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/**
* @return boolean
*/
public function Published() {
return !empty($this->record['WasPublished']);
}
/**
* Copied from DataObject to allow access via dot notation.
*/
public function relField($fieldName) {
$component = $this;
if(strpos($fieldName, '.') !== false) {
$parts = explode('.', $fieldName);
$fieldName = array_pop($parts);
// Traverse dot syntax
foreach($parts as $relation) {
if($component instanceof SS_List) {
if(method_exists($component,$relation)) {
$component = $component->$relation();
} else {
$component = $component->relation($relation);
}
} else {
$component = $component->$relation();
}
}
}
// Unlike has-one's, these "relations" can return false
if($component) {
if ($component->hasMethod($fieldName)) {
return $component->$fieldName();
}
return $component->$fieldName;
}
}
}