Move SerializableResource to ActiveModelSerializers namespace

Ref. https://github.com/rails-api/active_model_serializers/pull/1310

docs/ARCHITECTURE.md

@@ -23,7 +23,7 @@ serializer. For example, the `Attributes` example represents each serializer as
 unmodified attributes.  The `JsonApi` adapter represents the serializer as a [JSON
 API](http://jsonapi.org/) document.
 
-The **`ActiveModel::SerializableResource`** acts to coordinate the serializer(s) and adapter
+The **`ActiveModelSerializers::SerializableResource`** acts to coordinate the serializer(s) and adapter
 to an object that responds to `to_json`, and `as_json`.  It is used in the controller to
 encapsulate the serialization resource when rendered. However, it can also be used on its own
 to serialize a resource outside of a controller, as well.
@@ -62,16 +62,16 @@ High-level overview:
   - `:each_serializer` specifies the serializer for each resource in the collection.
 - For a single resource, the `:serializer` option is the resource serializer.
 - Options are partitioned in serializer options and adapter options.  Keys for adapter options are specified by
-    [`ADAPTER_OPTION_KEYS`](https://github.com/rails-api/active_model_serializers/blob/master/lib/active_model/serializable_resource.rb#L4).
+    [`ADAPTER_OPTION_KEYS`](https://github.com/rails-api/active_model_serializers/blob/master/lib/active_model_serializers/serializable_resource.rb#L5).
     The remaining options are serializer options.
 
 Details:
 
 1. **ActionController::Serialization**
-  1. `serializable_resource = ActiveModel::SerializableResource.new(resource, options)`
+  1. `serializable_resource = ActiveModelSerializers::SerializableResource.new(resource, options)`
     1. `options` are partitioned into `adapter_opts` and everything else (`serializer_opts`).
-      The `adapter_opts`  keys are defined in `ActiveModel::SerializableResource::ADAPTER_OPTION_KEYS`.
-1. **ActiveModel::SerializableResource**
+      The `adapter_opts`  keys are defined in `ActiveModelSerializers::SerializableResource::ADAPTER_OPTION_KEYS`.
+1. **ActiveModelSerializers::SerializableResource**
   1. `if serializable_resource.serializer?` (there is a serializer for the resource, and an adapter is used.)
     - Where `serializer?` is `use_adapter? && !!(serializer)`
       - Where `use_adapter?`: 'True when no explicit adapter given, or explicit value is truthy (non-nil);
@@ -122,5 +122,5 @@ render json: MyModel.new(level: 'awesome'), adapter: :json
 would be serialized the same as
 
 ```ruby
-ActiveModel::SerializableResource.new(MyModel.new(level: 'awesome'), adapter: :json).as_json
+ActiveModelSerializers::SerializableResource.new(MyModel.new(level: 'awesome'), adapter: :json).as_json
 ```

docs/general/rendering.md

@@ -56,11 +56,11 @@ API for a plain-old Ruby object (PORO).
 
 ## SerializableResource options
 
-The `options` hash passed to `render` or `ActiveModel::SerializableResource.new(resource, options)`
+The `options` hash passed to `render` or `ActiveModelSerializers::SerializableResource.new(resource, options)`
 are partitioned into `serializer_opts` and `adapter_opts`. `adapter_opts` are passed to new Adapters;
 `serializer_opts` are passed to new Serializers.
 
-The `adapter_opts` are specified in [ActiveModel::SerializableResource::ADAPTER_OPTIONS](../../lib/active_model/serializable_resource.rb#L4).
+The `adapter_opts` are specified in [ActiveModelSerializers::SerializableResource::ADAPTER_OPTIONS](../../lib/active_model_serializers/serializable_resource.rb#L5).
 The `serializer_opts` are the remaining options.
 
 (In Rails, the `options` are also passed to the `as_json(options)` or `to_json(options)`

docs/howto/outside_controller_use.md

@@ -14,7 +14,7 @@ post = Post.create(title: "Sample post", body: "I love Active Model Serializers!
 options = {}
 
 # Create a serializable resource instance
-serializable_resource = ActiveModel::SerializableResource.new(post, options)
+serializable_resource = ActiveModelSerializers::SerializableResource.new(post, options)
 
 # Convert your resource into json
 model_json = serializable_resource.as_json
@@ -38,20 +38,20 @@ serializer = ActiveModel::Serializer.serializer_for(post, options)
 You could also retrieve the serializer via:
 
 ```ruby
-ActiveModel::SerializableResource.new(post, options).serializer
+ActiveModelSerializers::SerializableResource.new(post, options).serializer
 ```
 
 Both approaches will return an instance, if any, of the resource's serializer.
 
 ## Serializing before controller render
 
-At times, you might want to use a serializer without rendering it to the view. For those cases, you can create an instance of `ActiveModel::SerializableResource` with
+At times, you might want to use a serializer without rendering it to the view. For those cases, you can create an instance of `ActiveModelSerializers::SerializableResource` with
 the resource you want to be serialized and call `.as_json`.
 
 ```ruby
 def create
   message = current_user.messages.create!(message_params)
-  message_json = ActiveModel::SerializableResource.new(message).as_json
+  message_json = ActiveModelSerializers::SerializableResource.new(message).as_json
   MessageCreationWorker.perform(message_json)
   head 204
 end

docs/jsonapi/errors.md

@@ -40,7 +40,7 @@ options = nil
 resource = ModelWithErrors.new
 resource.errors.add(:name, 'must be awesome')
 
-serializable_resource = ActiveModel::SerializableResource.new(
+serializable_resource = ActiveModelSerializers::SerializableResource.new(
   resource, {
     serializer: ActiveModel::Serializer::ErrorSerializer,
     adapter: :json_api