Grape formatter feature requested in #1258 - Rebased and Repushed (#1273)

CHANGELOG.md

@@ -14,6 +14,7 @@ Breaking changes:
 
 Features:
 
+- [#1336](https://github.com/rails-api/active_model_serializers/pull/1336) Added support for Grape >= 0.13, < 1.0
 - [#1291](https://github.com/rails-api/active_model_serializers/pull/1291) Add logging (@maurogeorge)
 - [#1225](https://github.com/rails-api/active_model_serializers/pull/1225) Better serializer lookup, use nested serializer when it exists (@beauby)
 - [#1172](https://github.com/rails-api/active_model_serializers/pull/1172) Better serializer registration, get more than just the first module (@bf4)

active_model_serializers.gemspec

@@ -53,4 +53,5 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency 'bundler', '~> 1.6'
   spec.add_development_dependency 'timecop', '~> 0.7'
   spec.add_development_dependency 'minitest-reporters'
+  spec.add_development_dependency 'grape', ['>= 0.13', '< 1.0']
 end

docs/README.md

@@ -23,7 +23,7 @@ This is the documentation of AMS, it's focused on the **0.10.x version.**
 |----|-----|----
 | Ember.js | 0.9.x | [active-model-adapter](https://github.com/ember-data/active-model-adapter)
 | Ember.js | 0.10.x + |  [docs/integrations/ember-and-json-api.md](integrations/ember-and-json-api.md)
-| Grape | 0.10.x + | [#1258](https://github.com/rails-api/active_model_serializers/issues/1258)  |
+| Grape | 0.10.x + | [docs/integrations/grape.md](integrations/grape.md)  |
 | Grape | 0.9.x | https://github.com/jrhe/grape-active_model_serializers/ |
 | Sinatra | 0.9.x | https://github.com/SauloSilva/sinatra-active-model-serializers/
 

docs/integrations/grape.md

@@ -0,0 +1,19 @@
+# Integration with Grape
+
+[Grape](https://github.com/ruby-grape/grape) is an opinionated micro-framework for creating REST-like APIs in ruby.
+
+ActiveModelSerializers currently supports Grape >= 0.13, < 1.0
+
+To add [Grape](https://github.com/ruby-grape/grape) support, enable the formatter and helper functions by including `Grape::ActiveModelSerializers` in your base endpoint. For example:
+
+```ruby
+module Example
+  class Dummy < Grape::API
+    require 'grape/active_model_serializers'
+    include Grape::ActiveModelSerializers
+    mount Example::V1::Base
+  end
+end
+```
+
+Aside from this, [configuration](../general/configuration_options.md) of ActiveModelSerializers is exactly the same.

lib/grape/active_model_serializers.rb

@@ -0,0 +1,14 @@
+# To add Grape support, require 'grape/active_model_serializers' in the base of your Grape endpoints
+# Then add 'include Grape::ActiveModelSerializers' to enable the formatter and helpers
+require 'active_model_serializers'
+require 'grape/formatters/active_model_serializers'
+require 'grape/helpers/active_model_serializers'
+
+module Grape::ActiveModelSerializers
+  extend ActiveSupport::Concern
+
+  included do
+    formatter :json, Grape::Formatters::ActiveModelSerializers
+    helpers Grape::Helpers::ActiveModelSerializers
+  end
+end

lib/grape/formatters/active_model_serializers.rb

@@ -0,0 +1,15 @@
+# A Grape response formatter that can be used as 'formatter :json, Grape::Formatters::ActiveModelSerializers'
+#
+# Serializer options can be passed as a hash from your Grape endpoint using env[:active_model_serializer_options],
+# or better yet user the render helper in Grape::Helpers::ActiveModelSerializers
+module Grape
+  module Formatters
+    module ActiveModelSerializers
+      def self.call(resource, env)
+        serializer_options = {}
+        serializer_options.merge!(env[:active_model_serializer_options]) if env[:active_model_serializer_options]
+        ActiveModel::SerializableResource.new(resource, serializer_options).to_json
+      end
+    end
+  end
+end

lib/grape/helpers/active_model_serializers.rb

@@ -0,0 +1,16 @@
+# Helpers can be included in your Grape endpoint as: helpers Grape::Helpers::ActiveModelSerializers
+module Grape
+  module Helpers
+    module ActiveModelSerializers
+      # A convenience method for passing ActiveModelSerializers serializer options
+      #
+      # Example: To include relationships in the response: render(post, include: ['comments'])
+      #
+      # Example: To include pagination meta data: render(posts, meta: { page: posts.page, total_pages: posts.total_pages })
+      def render(resource, active_model_serializer_options = {})
+        env[:active_model_serializer_options] = active_model_serializer_options
+        resource
+      end
+    end
+  end
+end

test/grape_test.rb

@@ -0,0 +1,89 @@
+require 'test_helper'
+require 'grape'
+require 'grape/active_model_serializers'
+
+class ActiveModelSerializers::GrapeTest < Minitest::Test
+  include Rack::Test::Methods
+
+  class GrapeTest < Grape::API
+    format :json
+    include Grape::ActiveModelSerializers
+
+    resources :grape do
+      get '/render' do
+        render ARModels::Post.new(title: 'Dummy Title', body: 'Lorem Ipsum')
+      end
+
+      get '/render_with_json_api' do
+        post = ARModels::Post.new(title: 'Dummy Title', body: 'Lorem Ipsum')
+        render post, meta: { page: 1, total_pages: 2 }, adapter: :json_api
+      end
+
+      get '/render_array_with_json_api' do
+        post = ARModels::Post.create(title: 'Dummy Title', body: 'Lorem Ipsum')
+        post.dup.save
+        render ARModels::Post.all, adapter: :json_api
+      end
+    end
+  end
+
+  def app
+    GrapeTest.new
+  end
+
+  def test_formatter_returns_json
+    get '/grape/render'
+
+    post = ARModels::Post.new(title: 'Dummy Title', body: 'Lorem Ipsum')
+    serializable_resource = serializable(post)
+
+    assert last_response.ok?
+    assert_equal serializable_resource.to_json, last_response.body
+  end
+
+  def test_render_helper_passes_through_options_correctly
+    get '/grape/render_with_json_api'
+
+    post = ARModels::Post.new(title: 'Dummy Title', body: 'Lorem Ipsum')
+    serializable_resource = serializable(post, serializer: ARModels::PostSerializer, adapter: :json_api, meta: { page: 1, total_pages: 2 })
+
+    assert last_response.ok?
+    assert_equal serializable_resource.to_json, last_response.body
+  end
+
+  def test_formatter_handles_arrays
+    get '/grape/render_array_with_json_api'
+
+    expected = {
+      'data' => [
+        {
+          id: '1',
+          type: 'ar_models_posts',
+          attributes: {
+            title: 'Dummy Title',
+            body: 'Lorem Ipsum'
+          },
+          relationships: {
+            comments: { data: [] },
+            author: { data: nil }
+          }
+        },
+        {
+          id: '2',
+          type: 'ar_models_posts',
+          attributes: {
+            title: 'Dummy Title',
+            body: 'Lorem Ipsum'
+          },
+          relationships: {
+            comments: { data: [] },
+            author: { data: nil }
+          }
+        }
+      ]
+    }
+
+    assert last_response.ok?
+    assert_equal expected.to_json, last_response.body
+  end
+end