Merge branch 'master' into domitian-move-namespace-of-adapter-to-active-model-serializers

Conflicts:
	CHANGELOG.md
	lib/active_model/serializer/adapter/attributes.rb
	lib/active_model/serializer/adapter/cached_serializer.rb
	lib/active_model/serializer/adapter/fragment_cache.rb
	lib/active_model/serializer/adapter/json_api.rb
	lib/active_model/serializer/adapter/json_api/link.rb
	test/adapter/fragment_cache_test.rb
	test/adapter/json_api/links_test.rb
	test/adapter/json_api/resource_type_config_test.rb

lib/active_model/serializer/adapter/json_api/api_objects.rb

@@ -0,0 +1,13 @@
+module ActiveModel
+  class Serializer
+    module Adapter
+      class JsonApi
+        module ApiObjects
+          extend ActiveSupport::Autoload
+          autoload :Relationship
+          autoload :ResourceIdentifier
+        end
+      end
+    end
+  end
+end

lib/active_model/serializer/adapter/json_api/api_objects/relationship.rb

@@ -0,0 +1,52 @@
+module ActiveModel
+  class Serializer
+    module Adapter
+      class JsonApi
+        module ApiObjects
+          class Relationship
+            def initialize(parent_serializer, serializer, options = {}, links = {}, meta = nil)
+              @object = parent_serializer.object
+              @scope = parent_serializer.scope
+
+              @options = options
+              @data = data_for(serializer, options)
+              @links = links.each_with_object({}) do |(key, value), hash|
+                hash[key] = ActiveModelSerializers::Adapter::JsonApi::Link.new(parent_serializer, value).as_json
+              end
+              @meta = meta.respond_to?(:call) ? parent_serializer.instance_eval(&meta) : meta
+            end
+
+            def as_json
+              hash = {}
+              hash[:data] = data if options[:include_data]
+              links = self.links
+              hash[:links] = links if links.any?
+              meta = self.meta
+              hash[:meta] = meta if meta
+
+              hash
+            end
+
+            protected
+
+            attr_reader :object, :scope, :data, :options, :links, :meta
+
+            private
+
+            def data_for(serializer, options)
+              if serializer.respond_to?(:each)
+                serializer.map { |s| ResourceIdentifier.new(s).as_json }
+              else
+                if options[:virtual_value]
+                  options[:virtual_value]
+                elsif serializer && serializer.object
+                  ResourceIdentifier.new(serializer).as_json
+                end
+              end
+            end
+          end
+        end
+      end
+    end
+  end
+end

lib/active_model/serializer/adapter/json_api/api_objects/resource_identifier.rb

@@ -0,0 +1,39 @@
+module ActiveModel
+  class Serializer
+    module Adapter
+      class JsonApi
+        module ApiObjects
+          class ResourceIdentifier
+            def initialize(serializer)
+              @id = id_for(serializer)
+              @type = type_for(serializer)
+            end
+
+            def as_json
+              { id: id, type: type }
+            end
+
+            protected
+
+            attr_reader :id, :type
+
+            private
+
+            def type_for(serializer)
+              return serializer._type if serializer._type
+              if ActiveModelSerializers.config.jsonapi_resource_type == :singular
+                serializer.object.class.model_name.singular
+              else
+                serializer.object.class.model_name.plural
+              end
+            end
+
+            def id_for(serializer)
+              serializer.read_attribute_for_serialization(:id).to_s
+            end
+          end
+        end
+      end
+    end
+  end
+end

lib/active_model/serializer/adapter/json_api/meta.rb

@@ -0,0 +1,29 @@
+module ActiveModel
+  class Serializer
+    module Adapter
+      class JsonApi
+        class Meta
+          def initialize(serializer)
+            @object = serializer.object
+            @scope = serializer.scope
+
+            # Use the return value of the block unless it is nil.
+            if serializer._meta.respond_to?(:call)
+              @value = instance_eval(&serializer._meta)
+            else
+              @value = serializer._meta
+            end
+          end
+
+          def as_json
+            @value
+          end
+
+          protected
+
+          attr_reader :object, :scope
+        end
+      end
+    end
+  end
+end