DOCS: Document new schema config, change to resolver discovery pattern (#9781)

docs/en/02_Developer_Guides/19_GraphQL/01_getting_started/02_configuring_your_schema.md

@@ -49,6 +49,8 @@ Let's populate a schema that is pre-configured for us out of the box, `default`.
 SilverStripe\GraphQL\Schema\Schema:
   schemas:
     default:
+      config:
+        # general schema config here
       types:
         # your generic types here
       models:
@@ -79,7 +81,10 @@ SilverStripe\GraphQL\Schema\Schema:
       src: app/_graphql
 ```
 
-It can also be an array of directories.
+[info]
+It is recommended that you define your sources as an array so that further source files are merged.
+ Otherwise, another config file could completely override part of your schema definition.
+[/info]
 
 **app/_config/graphql.yml**
 ```yml
@@ -87,8 +92,8 @@ SilverStripe\GraphQL\Schema\Schema:
   schemas:
     default:
       src:
-        myDir: app/_graphql
-        myOtherDir: module/_graphql
+        - app/_graphql
+        - module/_graphql
 ```
 
 [info]
@@ -107,6 +112,8 @@ This doesn't mean there is never a need to flush your schema config. If you were
 **app/_graphql/schema.yml**
 ```yaml
 # no schema key needed. it's implied!
+config:
+  # your schema config here
 types:
   # your generic types here
 models:
@@ -121,7 +128,7 @@ mutations:
 
 Your schema YAML file will get quite bloated if it's just used as a monolithic source of truth
 like this. We can tidy this up quite a bit by simply placing the files in directories that map
-to the keys they populate -- e.g. `types/`, `models/`, `queries/`, `mutations/`, etc.
+to the keys they populate -- e.g. `config/`, `types/`, `models/`, `queries/`, `mutations/`, etc.
 
 There are two approaches to namespacing:
 * By filename
@@ -132,6 +139,11 @@ There are two approaches to namespacing:
 If you use a parent directory name (at any depth) of one of the four keywords above, it will
 be implicitly placed in the corresponding section of the schema.
 
+**app/_graphql/types/config.yml**
+```yaml
+# my schema config here
+```
+
 **app/_graphql/types/types.yml**
 ```yaml
 # my type definitions here
@@ -169,23 +181,22 @@ The following are perfectly valid:
 * `app/_graphql/news-and-blog/models/blog.yml`
 * `app/_graphql/mySchema.yml`
 
-### Changing schema defaults
+### Schema config
 
-In addition to all the keys mentioned above, each schema can declare a couple of generic
- configuration files, `defaults` and `modelConfig`. These are
- mostly used for assigning or removing  default plugins to models and operations.
+In addition to all the keys mentioned above, each schema can declare a generic
+ configuration section, `config`. This are mostly used for assigning or removing plugins
+ and resolvers.
 
-[info]
-As of now, the only one of these being used 
- is `modelConfig`, but `defaults` could some day apply non-model configuration to the schema.
-[/info]
+An important subsection of `config` is `modelConfig`, where you can configure settings for specific
+models, e.g. `DataObject`.
 
-Like the other sections, it can have its own `modelConfig.yml`, or just be added as a `modelConfig:` 
+Like the other sections, it can have its own `config.yml`, or just be added as a `config:` 
 mapping to a generic schema yaml document.
 
-**app/_graphql/modelConfig.yml**
+**app/_graphql/config.yml**
 ```yaml
-DataObject:
+modelConfig:
+  DataObject:
     plugins:
       inheritance: true
     operations:

docs/en/02_Developer_Guides/19_GraphQL/01_getting_started/03_building_the_schema.md

@@ -84,8 +84,7 @@ tangential changes such as:
 
 ### Viewing the generated code
 
-TODO, once we figure out where it will go
-
+By default, the generated code is placed in the `.graphql/` directory in the root of your project.
 
 ### Further reading
 

docs/en/02_Developer_Guides/19_GraphQL/01_getting_started/06_using_procedual_code.md

@@ -33,15 +33,16 @@ on the fly as closures. Resolvers must be static methods on a class, and are eva
 the schema build.
 [/notice]
 
-### Adding a schema builder
+### Adding executable code
 
-We can use the `builders` section of the config to add an implementation of `SchemaUpdater`.
+We can use the `execute` section of the config to add an implementation of `SchemaUpdater`.
 
 ```yaml
 SilverStripe\GraphQL\Schema\Schema:
   schemas:
     default:
-      builders:
+      config:
+        execute:
           - 'MyProject\MySchema'
 ```
 

docs/en/02_Developer_Guides/19_GraphQL/02_working_with_dataobjects/01_dataobject_model_type.md

@@ -224,8 +224,8 @@ Page:
 
 There are several settings you can apply to your model class (typically `DataObjectModel`),
 but because they can have distinct values _per schema_, the standard `_config` layer is not
-an option. Model configuration has to be done within the schema definition in the `modelConfig`
-section.
+an option. Model configuration has to be done within the schema config in the `modelConfig`
+subsection.
 
 ### Customising the type name
 
@@ -245,9 +245,10 @@ the `$className` as a parameter.
 
 Let's turn `MyProject\Models\Product` into the more specific `MyProjectProduct`
 
-*app/_graphql/modelConfig.yml*
+*app/_graphql/config.yml*
 ```yaml
-DataObject: 
+modelConfig:
+  DataObject: 
     type_formatter: ['MyProject\Formatters', 'formatType' ]
 ```
 
@@ -277,9 +278,10 @@ public static function formatType(string $className): string
 You can also add prefixes to all your DataObject types. This can be a scalar value or a callable,
 using the same signature as `type_formatter`.
 
-*app/_graphql/modelConfig.yml*
+*app/_graphql/config.yml*
 ```yaml
-DataObject
+modelConfig:
+  DataObject
     type_prefix: 'MyProject'
 ```
 

docs/en/02_Developer_Guides/19_GraphQL/02_working_with_dataobjects/02_query_plugins.md

@@ -283,9 +283,10 @@ MyProject\Models\ProductCategory:
 
 To disable sort globally, use `modelConfig`:
 
-*app/_graphql/modelConfig.yml*
+*app/_graphql/config.yml*
 ```yaml
-DataObject:
+modelConfig:
+  DataObject:
     operations:
       read:
         plugins:

docs/en/02_Developer_Guides/19_GraphQL/03_working_with_generic_types/03_resolver_discovery.md

@@ -22,22 +22,43 @@ an explicit resolver and allow the system to discover one for you based on namin
 
 Let's start by registering a resolver class(es) where we can define a bunch of these functions.
 
+**app/_graphql/config.yml**
 ```yaml
-SilverStripe\Core\Injector\Injector:
-  SilverStripe\GraphQL\Schema\Registry\ResolverRegistry:
-    constructor:
-      myResolver: '%$MyProject\Resolvers\MyResolvers'
+resolvers:
+  - MyProject\Resolvers\MyResolvers
 ```
 
-What we're registering here is called a `ResolverProvider`, and it must implement that interface.
-The only thing this class is obliged to do is return a method name for a resolver given a type name and
-`Field` object. If the class does not contain a resolver for that combination, it may return null and
-defer to other resolver providers, or ultimately fallback on the global default resolver.
+What we're registering here is a generic class that should contain one or more static functions that resolve one
+or many fields. How those functions will be discovered relies on the _resolver strategy_.
+
+### Resolver strategy
+
+Each schema config accepts a `resolverStrategy` property. This should map to a callable that will return
+a method name given a class name, type name, and `Field` instance.
 
 ```php
-public static function getResolverMethod(?string $typeName = null, ?Field $field = null): ?string;
+public static function getResolverMethod(string $className, ?string $typeName = null, ?Field $field = null): ?string;
 ```
 
+#### The default resolver strategy
+
+By default, all schemas use `SilverStripe\GraphQL\Schema\Resolver\DefaultResolverStrategy::getResolerMethod`
+to discover resolver functions. The logic works like this:
+
+* Does `resolve<TypeName><FieldName>` exist?
+  * Yes? Invoke
+  * No? Continue
+* Does `resolve<TypeName>` exist?
+  * Yes? Invoke
+  * No? Continue
+* Does `resolve<FieldName>` exist?
+  * Yes? Invoke
+  * No? Continue
+* Does `resolve` exist?
+  * Yes? Invoke
+  * No? Return null. This resolver cannot be discovered
+
+
 Let's look at our query again:
 
 ```graphql
@@ -48,31 +69,33 @@ query {
 }
 ```
 
-An example implementation of this method for our example might be:
+Imagine we have two classes registered under `resolvers` -- `ClassA` and `ClassB`
 
-* Does `resolveCountryName` exist?
-  * Yes? Invoke
-  * No? Continue
-* Does `resolveCountry` exist?
-  * Yes? Invoke
-  * No? Continue
-* Does `resolveName` exist?
-  * Yes? Invoke
-  * No? Continue
-* Return null. Maybe someone else knows how to deal with this.
+The logic will go like this:
 
-You can implement whatever logic you like to help the resolver provider discover which of its methods
-it appropriate for the given type/field combination, but since the above pattern seems like a pretty common
-implementation, the module ships an abstract `DefaultResolverProvider` that applies this logic. You can just
-write the resolver methods!
+* `ClassA::resolveCountryName`
+* `ClassA::resolveCountry`
+* `ClassA::resolveName`
+* `ClassA::resolve`
+* `ClassB::resolveCountryName`
+* `ClassB::resolveCountry`
+* `ClassB::resolveName`
+* `ClassB::resolve`
+* Return null.
+
+You can implement whatever strategy you like in your schema. Just register it to `resolverStrategy` in the config.
+
+**app/_graphql/config.yml**
+```yaml
+resolverStrategy: [ 'MyApp\Resolvers\Strategy', 'getResolverMethod' ]
+```
 
 Let's add a resolver method to our resolver provider:
 
 **app/src/Resolvers/MyResolvers.php**
 ```php
-use SilverStripe\GraphQL\Schema\Resolver\DefaultResolverProvider;
 
-class MyResolvers extends DefaultResolverProvider
+class MyResolvers
 {
     public static function resolveReadCountries()
     {
@@ -90,14 +113,6 @@ class MyResolvers extends DefaultResolverProvider
 }
 ```
 
-To recap, the `DefaultResolverProvider` will follow this workflow to locate a resolver
-for this query:
-
-* `resolveQueryReadCountries()` (<typeName><fieldName>)
-* `resolveQuery()` (<typeName>)
-* `resolveReadCountries()` (<fieldName>)
-* `resolve` (catch-all)
-
 
 Now that we're using logic to discover our resolver, we can clean up the config a bit.
 

docs/en/02_Developer_Guides/19_GraphQL/06_extending/adding_a_custom_model.md

@@ -105,11 +105,10 @@ class ModelCreator implements SchemaModelCreatorInterface
 
 Just add it to the registry:
 
+**app/_graphql/config.yml
 ```yaml
-SilverStripe\Core\Injector\Injector:
-  SilverStripe\GraphQL\Schema\Registry\SchemaModelCreatorRegistry:
-    constructor:
-      dataobject: '%$SilverStripe\GraphQL\Schema\DataObject\ModelCreator'
+modelCreators:
+  - 'SilverStripe\GraphQL\Schema\DataObject\ModelCreator'
 ```
 
 ### Further reading

docs/en/02_Developer_Guides/19_GraphQL/06_extending/adding_a_custom_operation.md

@@ -73,10 +73,13 @@ public static function resolve(array $resolverContext = []): Closure
 Now, just add the operation to the `DataObjectModel` configuration
 to make it available to all DataObject types.
 
+**app/_graphql/config.yml**
 ```yaml
-SilverStripe\GraphQL\Schema\DataObject\DataObjectModel:
+modelConfig:
+  DataObject:
     operations:
-    duplicate: 'MyProject\Operations\DuplicateCreator'
+      duplicate:
+        class: 'MyProject\Operations\DuplicateCreator'
 ```
 
 And use it:

docs/en/02_Developer_Guides/19_GraphQL/07_tips_and_tricks.md

@@ -13,6 +13,43 @@ Docs for the current stable version (3.x) can be found
 [here](https://github.com/silverstripe/silverstripe-graphql/tree/3)
 [/alert]
 
+## Getting the type name for a model class
+
+Often times, you'll need to know the name of the type given a class name. There's a bit of context to this.
+
+### Getting the type name at build time
+
+If you need to know the name of the type _during the build_, e.g. creating the name of an operation, field, query, etc,
+you should use the `Build::requireActiveBuild()` accessor. This will get you the schema that is currently being built,
+and throw if no build is active. A more tolerant method is `getActiveBuild()` which will return null if no schema
+is being built.
+
+```php
+Build::requireActiveBuild()->findOrMakeModel($className)->getName();
+```
+
+### Getting the type name from within your app
+
+If you need the type name during normal execution of your app, e.g. to display in your UI, you can rely
+on the cached typenames, which are persisted alongside your generated schema code.
+
+```php
+Schema::create('default')->getTypeNameForClass($className);
+```
+
+### Why is there a difference?
+
+It is expensive to load all of the schema config. The `getTypeNameForClass` function avoids the need to
+load the config, and reads directly from the cache. To be clear, the following is functionally equivalent,
+but slow:
+
+```php
+Schema::create('default')
+  ->loadFromConfig()
+  ->findOrMakeModel($className)
+  ->getName();
+```
+
 ## Persisting queries
 
 A common pattern in GraphQL APIs is to store queries on the server by an identifier. This helps save