reverting PR rails-api#909 and adding json api usage advise on readme

README.md

@@ -8,7 +8,7 @@ AMS does this through two components: **serializers** and **adapters**.
 Serializers describe _which_ attributes and relationships should be serialized.
 Adapters describe _how_ attributes and relationships should be serialized.
 
-By default AMS will use the JsonApi Adapter that follows RC4 of the format specified in [jsonapi.org/format](http://jsonapi.org/format).
+By default AMS will use the **Json Adapter**. But we strongly advise you to use JsonApi Adapter that follows RC4 of the format specified in [jsonapi.org/format](http://jsonapi.org/format).
 Check how to change the adapter in the sections bellow.
 
 # RELEASE CANDIDATE, PLEASE READ
@@ -50,17 +50,17 @@ end
 ```
 
 Generally speaking, you as a user of AMS will write (or generate) these
-serializer classes. If you want to use a different adapter, such as a normal Json adapter without the JsonApi conventions, you can
+serializer classes. If you want to use a different adapter, such as a JsonApi, you can
 change this in an initializer:
 
 ```ruby
-ActiveModel::Serializer.config.adapter = ActiveModel::Serializer::Adapter::Json
+ActiveModel::Serializer.config.adapter = ActiveModel::Serializer::Adapter::JsonApi
 ```
 
 or
 
 ```ruby
-ActiveModel::Serializer.config.adapter = :json
+ActiveModel::Serializer.config.adapter = :json_api
 ```
 
 You won't need to implement an adapter unless you wish to use a new format or

lib/active_model/serializer/configuration.rb

@@ -6,7 +6,7 @@ module Configuration
 
       included do |base|
         base.config.array_serializer = ActiveModel::Serializer::ArraySerializer
-        base.config.adapter = :json_api
+        base.config.adapter = :json
       end
     end
   end

test/action_controller/adapter_selector_test.rb

@@ -4,7 +4,7 @@ module ActionController
   module Serialization
     class AdapterSelectorTest < ActionController::TestCase
       class MyController < ActionController::Base
-        def render_using_the_initializer_defined_adapter
+        def render_using_default_adapter
           @profile = Profile.new({ name: 'Name 1', description: 'Description 1', comments: 'Comments 1' })
           render json: @profile
         end
@@ -23,7 +23,7 @@ def render_skipping_adapter
       tests MyController
 
       def test_render_using_default_adapter
-        get :render_using_the_initializer_defined_adapter
+        get :render_using_default_adapter
         assert_equal '{"name":"Name 1","description":"Description 1"}', response.body
       end
 

test/fixtures/poro.rb

@@ -1,5 +1,3 @@
-ActiveModel::Serializer.config.adapter = :json
-
 class Model
   def initialize(hash={})
     @attributes = hash
@@ -66,7 +64,7 @@ class ProfilePreviewSerializer < ActiveModel::Serializer
 Bio      = Class.new(Model)
 Blog     = Class.new(Model)
 Role     = Class.new(Model)
-User     = Class.new(Model)
+User = Class.new(Model)
 Location = Class.new(Model)
 Place    = Class.new(Model)