Move adapter cache properties to class level (where they belong).

lib/active_model/serializer.rb

@@ -109,6 +109,10 @@ module ActiveModel
       end
     end
 
+    def self.serialization_adapter_instance
+      @serialization_adapter_instance ||= ActiveModelSerializers::Adapter::Attributes
+    end
+
     attr_accessor :object, :root, :scope
 
     # `scope_name` is set as :current_user by default in the controller.
@@ -163,8 +167,7 @@ module ActiveModel
     def serializable_hash(adapter_opts = nil)
       adapter_opts ||= {}
       adapter_opts = { include: '*' }.merge!(adapter_opts)
-      adapter_instance = ActiveModelSerializers::Adapter::Attributes.new(self, adapter_opts)
-      serialize(adapter_opts, {}, adapter_instance)
+      serialize(adapter_opts)
     end
     alias to_hash serializable_hash
     alias to_h serializable_hash
@@ -197,7 +200,7 @@ module ActiveModel
     end
 
     # @api private
-    def serialize(adapter_options, options, adapter_instance)
+    def serialize(adapter_options, options = {}, adapter_instance = self.class.serialization_adapter_instance)
       options[:include_directive] ||= ActiveModel::Serializer.include_directive_from_options(adapter_options)
       cached_attributes = adapter_options[:cached_attributes] ||= {}
       resource = cached_attributes(options[:fields], cached_attributes, adapter_instance)

lib/active_model/serializer/caching.rb

@@ -318,7 +318,7 @@ module ActiveModel
 
         parts = []
         parts << object_cache_key
-        parts << adapter_instance.cached_name
+        parts << adapter_instance.cache_key
         parts << self.class._cache_digest unless self.class._skip_digest?
         @cache_key = parts.join('/')
       end

lib/active_model_serializers/adapter.rb

@@ -51,6 +51,10 @@ module ActiveModelSerializers
         self
       end
 
+      def registered_name(adapter_class)
+        ADAPTER_MAP.key adapter_class
+      end
+
       # @param  adapter [String, Symbol, Class] name to fetch adapter by
       # @return [ActiveModelSerializers::Adapter] subclass of Adapter
       # @raise  [UnknownAdapterError]

lib/active_model_serializers/adapter/base.rb

@@ -8,6 +8,40 @@ module ActiveModelSerializers
         ActiveModelSerializers::Adapter.register(subclass)
       end
 
+      # Sets the default transform for the adapter.
+      #
+      # @return [Symbol] the default transform for the adapter
+      def self.default_key_transform
+        :unaltered
+      end
+
+      # Determines the transform to use in order of precedence:
+      #   adapter option, global config, adapter default.
+      #
+      # @param options [Object]
+      # @return [Symbol] the transform to use
+      def self.transform(options)
+        return options[:key_transform] if options && options[:key_transform]
+        ActiveModelSerializers.config.key_transform || default_key_transform
+      end
+
+      # Transforms the casing of the supplied value.
+      #
+      # @param value [Object] the value to be transformed
+      # @param options [Object] serializable resource options
+      # @return [Symbol] the default transform for the adapter
+      def self.transform_key_casing!(value, options)
+        KeyTransform.send(transform(options), value)
+      end
+
+      def self.cache_key
+        @cache_key ||= ActiveModelSerializers::Adapter.registered_name(self)
+      end
+
+      def self.fragment_cache(cached_hash, non_cached_hash)
+        non_cached_hash.merge cached_hash
+      end
+
       attr_reader :serializer, :instance_options
 
       def initialize(serializer, options = {})
@@ -15,10 +49,6 @@ module ActiveModelSerializers
         @instance_options = options
       end
 
-      def cached_name
-        @cached_name ||= self.class.name.demodulize.underscore
-      end
-
       # Subclasses that implement this method must first call
       #   options = serialization_options(options)
       def serializable_hash(_options = nil)
@@ -29,8 +59,12 @@ module ActiveModelSerializers
         serializable_hash(options)
       end
 
+      def cache_key
+        self.class.cache_key
+      end
+
       def fragment_cache(cached_hash, non_cached_hash)
-        non_cached_hash.merge cached_hash
+        self.class.fragment_cache(cached_hash, non_cached_hash)
       end
 
       private
@@ -44,34 +78,6 @@ module ActiveModelSerializers
       def root
         serializer.json_key.to_sym if serializer.json_key
       end
-
-      class << self
-        # Sets the default transform for the adapter.
-        #
-        # @return [Symbol] the default transform for the adapter
-        def default_key_transform
-          :unaltered
-        end
-
-        # Determines the transform to use in order of precedence:
-        #   adapter option, global config, adapter default.
-        #
-        # @param options [Object]
-        # @return [Symbol] the transform to use
-        def transform(options)
-          return options[:key_transform] if options && options[:key_transform]
-          ActiveModelSerializers.config.key_transform || default_key_transform
-        end
-
-        # Transforms the casing of the supplied value.
-        #
-        # @param value [Object] the value to be transformed
-        # @param options [Object] serializable resource options
-        # @return [Symbol] the default transform for the adapter
-        def transform_key_casing!(value, options)
-          KeyTransform.send(transform(options), value)
-        end
-      end
     end
   end
 end

lib/active_model_serializers/adapter/json_api.rb

@@ -31,16 +31,27 @@ module ActiveModelSerializers
       autoload :Error
       autoload :Deserialization
 
+      def self.default_key_transform
+        :dash
+      end
+
+      def self.fragment_cache(cached_hash, non_cached_hash, root = true)
+        core_cached       = cached_hash.first
+        core_non_cached   = non_cached_hash.first
+        no_root_cache     = cached_hash.delete_if { |key, _value| key == core_cached[0] }
+        no_root_non_cache = non_cached_hash.delete_if { |key, _value| key == core_non_cached[0] }
+        cached_resource   = (core_cached[1]) ? core_cached[1].deep_merge(core_non_cached[1]) : core_non_cached[1]
+        hash = root ? { root => cached_resource } : cached_resource
+
+        hash.deep_merge no_root_non_cache.deep_merge no_root_cache
+      end
+
       def initialize(serializer, options = {})
         super
         @include_directive = JSONAPI::IncludeDirective.new(options[:include], allow_wildcard: true)
         @fieldset = options[:fieldset] || ActiveModel::Serializer::Fieldset.new(options.delete(:fields))
       end
 
-      def self.default_key_transform
-        :dash
-      end
-
       # {http://jsonapi.org/format/#crud Requests are transactional, i.e. success or failure}
       # {http://jsonapi.org/format/#document-top-level data and errors MUST NOT coexist in the same document.}
       def serializable_hash(*)
@@ -52,6 +63,11 @@ module ActiveModelSerializers
         self.class.transform_key_casing!(document, instance_options)
       end
 
+      def fragment_cache(cached_hash, non_cached_hash)
+        root = !instance_options.include?(:include)
+        self.class.fragment_cache(cached_hash, non_cached_hash, root)
+      end
+
       # {http://jsonapi.org/format/#document-top-level Primary data}
       # definition:
       #   ☐ toplevel_data (required)
@@ -174,18 +190,6 @@ module ActiveModelSerializers
         hash
       end
 
-      def fragment_cache(cached_hash, non_cached_hash)
-        root = false if instance_options.include?(:include)
-        core_cached       = cached_hash.first
-        core_non_cached   = non_cached_hash.first
-        no_root_cache     = cached_hash.delete_if { |key, _value| key == core_cached[0] }
-        no_root_non_cache = non_cached_hash.delete_if { |key, _value| key == core_non_cached[0] }
-        cached_resource   = (core_cached[1]) ? core_cached[1].deep_merge(core_non_cached[1]) : core_non_cached[1]
-        hash = root ? { root => cached_resource } : cached_resource
-
-        hash.deep_merge no_root_non_cache.deep_merge no_root_cache
-      end
-
       protected
 
       attr_reader :fieldset

test/cache_test.rb

@@ -102,13 +102,13 @@ module ActiveModelSerializers
 
       render_object_with_cache(uncached_author)
       key = "#{uncached_author_serializer.class._cache_key}/#{uncached_author_serializer.object.id}-#{uncached_author_serializer.object.updated_at.strftime("%Y%m%d%H%M%S%9N")}"
-      key = "#{key}/#{adapter.cached_name}"
+      key = "#{key}/#{adapter.cache_key}"
       assert_equal(uncached_author_serializer.attributes.to_json, cache_store.fetch(key).to_json)
     end
 
     def test_default_cache_key_fallback
       render_object_with_cache(@comment)
-      key = "#{@comment.cache_key}/#{adapter.cached_name}"
+      key = "#{@comment.cache_key}/#{adapter.cache_key}"
       assert_equal(@comment_serializer.attributes.to_json, cache_store.fetch(key).to_json)
     end
 
@@ -139,9 +139,9 @@ module ActiveModelSerializers
       Timecop.freeze(Time.current) do
         render_object_with_cache(@post)
 
-        key = "#{@post.cache_key}/#{adapter.cached_name}"
+        key = "#{@post.cache_key}/#{adapter.cache_key}"
         assert_equal(@post_serializer.attributes, cache_store.fetch(key))
-        key = "#{@comment.cache_key}/#{adapter.cached_name}"
+        key = "#{@comment.cache_key}/#{adapter.cache_key}"
         assert_equal(@comment_serializer.attributes, cache_store.fetch(key))
       end
     end
@@ -152,9 +152,9 @@ module ActiveModelSerializers
         render_object_with_cache(@post)
 
         # Check if it cached the objects separately
-        key = "#{@post.cache_key}/#{adapter.cached_name}"
+        key = "#{@post.cache_key}/#{adapter.cache_key}"
         assert_equal(@post_serializer.attributes, cache_store.fetch(key))
-        key = "#{@comment.cache_key}/#{adapter.cached_name}"
+        key = "#{@comment.cache_key}/#{adapter.cache_key}"
         assert_equal(@comment_serializer.attributes, cache_store.fetch(key))
 
         # Simulating update on comments relationship with Post
@@ -166,9 +166,9 @@ module ActiveModelSerializers
         render_object_with_cache(@post)
 
         # Check if the the new comment was cached
-        key = "#{new_comment.cache_key}/#{adapter.cached_name}"
+        key = "#{new_comment.cache_key}/#{adapter.cache_key}"
         assert_equal(new_comment_serializer.attributes, cache_store.fetch(key))
-        key = "#{@post.cache_key}/#{adapter.cached_name}"
+        key = "#{@post.cache_key}/#{adapter.cache_key}"
         assert_equal(@post_serializer.attributes, cache_store.fetch(key))
       end
     end
@@ -184,7 +184,7 @@ module ActiveModelSerializers
       hash = render_object_with_cache(@location)
 
       assert_equal(hash, expected_result)
-      key = "#{@location.cache_key}/#{adapter.cached_name}"
+      key = "#{@location.cache_key}/#{adapter.cache_key}"
       assert_equal({ place: 'Nowhere' }, cache_store.fetch(key))
     end
 
@@ -276,7 +276,7 @@ module ActiveModelSerializers
 
     def test_uses_file_digest_in_cache_key
       render_object_with_cache(@blog)
-      key = "#{@blog.cache_key}/#{adapter.cached_name}/#{::Model::FILE_DIGEST}"
+      key = "#{@blog.cache_key}/#{adapter.cache_key}/#{::Model::FILE_DIGEST}"
       assert_equal(@blog_serializer.attributes, cache_store.fetch(key))
     end
 
@@ -291,7 +291,7 @@ module ActiveModelSerializers
       actual = ActiveModel::Serializer.object_cache_keys(serializable.adapter.serializer, serializable.adapter, include_directive)
 
       assert_equal 3, actual.size
-      assert actual.any? { |key| key == "comment/1/#{serializable.adapter.cached_name}" }
+      assert actual.any? { |key| key == "comment/1/#{serializable.adapter.cache_key}" }
       assert actual.any? { |key| key =~ %r{post/post-\d+} }
       assert actual.any? { |key| key =~ %r{author/author-\d+} }
     end
@@ -306,13 +306,13 @@ module ActiveModelSerializers
         include_directive = ActiveModelSerializers.default_include_directive
         cached_attributes = ActiveModel::Serializer.cache_read_multi(serializer, attributes, include_directive)
 
-        assert_equal cached_attributes["#{@comment.cache_key}/#{attributes.cached_name}"], Comment.new(id: 1, body: 'ZOMG A COMMENT').attributes
-        assert_equal cached_attributes["#{@comment.post.cache_key}/#{attributes.cached_name}"], Post.new(id: 'post', title: 'New Post', body: 'Body').attributes
+        assert_equal cached_attributes["#{@comment.cache_key}/#{attributes.cache_key}"], Comment.new(id: 1, body: 'ZOMG A COMMENT').attributes
+        assert_equal cached_attributes["#{@comment.post.cache_key}/#{attributes.cache_key}"], Post.new(id: 'post', title: 'New Post', body: 'Body').attributes
 
         writer = @comment.post.blog.writer
         writer_cache_key = writer.cache_key
 
-        assert_equal cached_attributes["#{writer_cache_key}/#{attributes.cached_name}"], Author.new(id: 'author', name: 'Joao M. D. Moura').attributes
+        assert_equal cached_attributes["#{writer_cache_key}/#{attributes.cache_key}"], Author.new(id: 'author', name: 'Joao M. D. Moura').attributes
       end
     end