Add basic JsonApiObject behavior

Finish #1147

Author: bf4

CHANGELOG.md

@@ -23,7 +23,7 @@ Features:
   * adds support for `pagination links` at top level of JsonApi adapter [@bacarini]
   * adds extended format for `include` option to JsonApi adapter [@beauby]
   * adds support for wildcards in `include` option [@beauby]
-  * adds support for top level jsonapi member support [@beauby]
+  * adds support for top level `jsonapi` member [@beauby, @bf4]
 
 Fixes:
 

docs/general/configuration_options.md

@@ -9,5 +9,11 @@ The following configuration options can be set on `ActiveModel::Serializer.confi
 ## JSON API
 
 - `jsonapi_resource_type`: Whether the `type` attributes of resources should be singular or plural. Possible values: `:singular, :plural`. Default: `:plural`.
-- `jsonapi_toplevel_member`: Whether to include a [top level JSON API member](http://jsonapi.org/format/#document-jsonapi-object) in the response document. Default: `false`.
-- `jsonapi_version`: The latest version of the spec the API conforms to. Used when `jsonapi_toplevel_member` is `true`. Default: `'1.0'`.
+- `jsonapi_include_toplevel_member`: Whether to include a [top level JSON API member](http://jsonapi.org/format/#document-jsonapi-object)
+   in the response document.
+   Default: `false`.
+- Used when `jsonapi_include_toplevel_member` is `true`:
+  - `jsonapi_version`: The latest version of the spec the API conforms to.
+    Default: `'1.0'`.
+  - `jsonapi_toplevel_meta`: Optional metadata. Not included if empty.
+    Default: `{}`.

lib/active_model/serializable_resource.rb

@@ -1,8 +1,7 @@
 require 'set'
 module ActiveModel
   class SerializableResource
-    ADAPTER_OPTION_KEYS = Set.new([:include, :fields, :adapter,
-                                   :jsonapi_toplevel_meta])
+    ADAPTER_OPTION_KEYS = Set.new([:include, :fields, :adapter])
 
     # Primary interface to composing a resource with a serializer and adapter.
     # @return the serializable_resource, ready for #as_json/#to_json/#serializable_hash.

lib/active_model/serializer.rb

@@ -1,5 +1,4 @@
 require 'thread_safe'
-require 'active_model/serializer/adapter'
 require 'active_model/serializer/array_serializer'
 require 'active_model/serializer/include_tree'
 require 'active_model/serializer/associations'
@@ -11,6 +10,7 @@ module ActiveModel
   class Serializer
     include Configuration
     include Associations
+    require 'active_model/serializer/adapter'
 
     # Matches
     #  "c:/git/emberjs/ember-crm-backend/app/serializers/lead_serializer.rb:1:in `<top (required)>'"

lib/active_model/serializer/adapter/json_api.rb

@@ -6,6 +6,32 @@ class JsonApi < Base
         autoload :PaginationLinks
         autoload :FragmentCache
 
+        module ApiObjects
+          # Make JSON API top-level jsonapi member opt-in
+          # ref: http://jsonapi.org/format/#document-top-level
+          ActiveModel::Serializer.config.jsonapi_include_toplevel_member = false
+          ActiveModel::Serializer.config.jsonapi_version = '1.0'
+          ActiveModel::Serializer.config.jsonapi_toplevel_meta = {}
+          module JsonApi
+            module_function
+
+            def include_member?
+              ActiveModel::Serializer.config.jsonapi_include_toplevel_member
+            end
+
+            def add!(document)
+              object = {
+               jsonapi: {
+                 version: ActiveModel::Serializer.config.jsonapi_version,
+                 meta: ActiveModel::Serializer.config.jsonapi_toplevel_meta
+               }
+              }
+              object[:jsonapi].reject! { |_, v| v.blank? }
+              document.merge!(object)
+            end
+          end
+        end
+
         def initialize(serializer, options = {})
           super
           @include_tree = IncludeTree.from_include_args(options[:include])
@@ -22,17 +48,14 @@ def serializable_hash(options = nil)
           options ||= {}
 
           hash =
-            if serializer.respond_to?(:each)
+            case
+            when serializer.respond_to?(:each)
               serializable_hash_for_collection(options)
             else
               serializable_hash_for_single_resource(options)
             end
 
-          if ActiveModel::Serializer.config.jsonapi_toplevel_member
-            hash[:jsonapi] = {}
-            hash[:jsonapi][:version] = ActiveModel::Serializer.config.jsonapi_version
-            hash[:jsonapi][:meta] = instance_options[:jsonapi_toplevel_meta] if instance_options[:jsonapi_toplevel_meta]
-          end
+          ApiObjects::JsonApi.include_member? && ApiObjects::JsonApi.add!(hash)
 
           hash
         end

lib/active_model/serializer/configuration.rb

@@ -4,12 +4,12 @@ module Configuration
       include ActiveSupport::Configurable
       extend ActiveSupport::Concern
 
+      # Configuration options may also be set in
+      # Serializers and Adapters
       included do |base|
         base.config.array_serializer = ActiveModel::Serializer::ArraySerializer
         base.config.adapter = :attributes
         base.config.jsonapi_resource_type = :plural
-        base.config.jsonapi_toplevel_member = false
-        base.config.jsonapi_version = '1.0'
       end
     end
   end

test/adapter/json_api/toplevel_jsonapi_test.rb

@@ -27,58 +27,56 @@ def setup
             @author.posts = []
           end
 
-          def with_config(option, value)
-            old_value = ActiveModel::Serializer.config[option]
-            ActiveModel::Serializer.config[option] = value
-            yield
-          ensure
-            ActiveModel::Serializer.config[option] = old_value
+          def test_toplevel_jsonapi_defaults_to_false
+            assert_equal config.fetch(:jsonapi_include_toplevel_member), false
           end
 
           def test_disable_toplevel_jsonapi
-            with_adapter :json_api do
-              with_config(:jsonapi_toplevel_member, false) do
-                hash = ActiveModel::SerializableResource.new(@post).serializable_hash
-                assert_nil(hash[:jsonapi])
-              end
+            with_config(jsonapi_include_toplevel_member: false) do
+              hash = serialize(@post)
+              assert_nil(hash[:jsonapi])
             end
           end
 
           def test_enable_toplevel_jsonapi
-            with_adapter :json_api do
-              with_config(:jsonapi_toplevel_member, true) do
-                hash = ActiveModel::SerializableResource.new(@post).serializable_hash
-                refute_nil(hash[:jsonapi])
-              end
+            with_config(jsonapi_include_toplevel_member: true) do
+              hash = serialize(@post)
+              refute_nil(hash[:jsonapi])
             end
           end
 
           def test_default_toplevel_jsonapi_version
-            with_adapter :json_api do
-              with_config(:jsonapi_toplevel_member, true) do
-                hash = ActiveModel::SerializableResource.new(@post).serializable_hash
-                assert_equal('1.0', hash[:jsonapi][:version])
-              end
+            with_config(jsonapi_include_toplevel_member: true) do
+              hash = serialize(@post)
+              assert_equal('1.0', hash[:jsonapi][:version])
             end
           end
 
           def test_toplevel_jsonapi_no_meta
-            with_adapter :json_api do
-              with_config(:jsonapi_toplevel_member, true) do
-                hash = ActiveModel::SerializableResource.new(@post).serializable_hash
-                assert_nil(hash[:jsonapi][:meta])
-              end
+            with_config(jsonapi_include_toplevel_member: true) do
+              hash = serialize(@post)
+              assert_nil(hash[:jsonapi][:meta])
             end
           end
 
           def test_toplevel_jsonapi_meta
-            with_adapter :json_api do
-              with_config(:jsonapi_toplevel_member, true) do
-                hash = ActiveModel::SerializableResource.new(@post, jsonapi_toplevel_meta: 'custom').serializable_hash
-                assert_equal('custom', hash[:jsonapi][:meta])
-              end
+            new_config = {
+              jsonapi_include_toplevel_member: true,
+              jsonapi_toplevel_meta: {
+                'copyright' => 'Copyright 2015 Example Corp.'
+              }
+            }
+            with_config(new_config) do
+              hash = serialize(@post)
+              assert_equal(new_config[:jsonapi_toplevel_meta], hash.fetch(:jsonapi).fetch(:meta))
             end
           end
+
+          private
+
+          def serialize(resource, options = {})
+            serializable(resource, { adapter: :json_api }.merge!(options)).serializable_hash
+          end
         end
       end
     end

test/support/serialization_testing.rb

@@ -1,4 +1,8 @@
 module SerializationTesting
+  def config
+    ActiveModel::Serializer.config
+  end
+
   private
 
   def generate_cached_serializer(obj)
@@ -18,6 +22,18 @@ def with_adapter(adapter)
     ActiveModel::Serializer.config.adapter = old_adapter
   end
   alias_method :with_configured_adapter, :with_adapter
+
+  def with_config(hash)
+    old_config = config.dup
+    ActiveModel::Serializer.config.update(hash)
+    yield
+  ensure
+    ActiveModel::Serializer.config.replace(old_config)
+  end
+
+  def serializable(resource, options = {})
+    ActiveModel::SerializableResource.new(resource, options)
+  end
 end
 
 class Minitest::Test