Remove 'Adapter' suffix from adapters since they are in Adapter:: namespace

lib/active_model/serializer.rb

@@ -77,7 +77,7 @@ module ActiveModel
     def self.adapter
       adapter_class = case config.adapter
                       when Symbol
-                        class_name = "ActiveModel::Serializer::Adapter::#{config.adapter.to_s.classify}Adapter"
+                        class_name = "ActiveModel::Serializer::Adapter::#{config.adapter.to_s.classify}"
                         if Object.const_defined?(class_name)
                           Object.const_get(class_name)
                         end

lib/active_model/serializer/adapter.rb

@@ -2,9 +2,9 @@ module ActiveModel
   class Serializer
     class Adapter
       extend ActiveSupport::Autoload
-      autoload :JsonAdapter
-      autoload :NullAdapter
-      autoload :JsonApiAdapter
+      autoload :Json
+      autoload :Null
+      autoload :JsonApi
 
       attr_reader :serializer
 

lib/active_model/serializer/adapter/json.rb

@@ -1,7 +1,7 @@
 module ActiveModel
   class Serializer
     class Adapter
-      class JsonAdapter < Adapter
+      class Json < Adapter
         def serializable_hash(options = {})
           serializer.attributes.each_with_object({}) do |(attr, value), h|
             h[attr] = value

lib/active_model/serializer/adapter/json_api.rb

@@ -1,7 +1,7 @@
 module ActiveModel
   class Serializer
     class Adapter
-      class JsonApiAdapter < Adapter
+      class JsonApi < Adapter
         def serializable_hash(options = {})
           @hash = serializer.attributes
 

lib/active_model/serializer/adapter/null.rb

@@ -1,7 +1,7 @@
 module ActiveModel
   class Serializer
     class Adapter
-      class NullAdapter < Adapter
+      class Null < Adapter
         def serializable_hash(options = {})
           {}
         end