Implement has_many

test/fixtures/poro.rb

@@ -25,6 +25,15 @@ end
 class Profile < Model
 end
 
+class Post < Model
+  def comments
+    @comments ||= [Comment.new(content: 'C1'),
+                   Comment.new(content: 'C2')]
+  end
+end
+
+class Comment < Model
+end
 
 ###
 ## Serializers
@@ -43,3 +52,13 @@ class ProfileSerializer < ActiveModel::Serializer
 
   attributes :name, :description
 end
+
+class PostSerializer < ActiveModel::Serializer
+  attributes :title, :body
+
+  has_many :comments
+end
+
+class CommentSerializer < ActiveModel::Serializer
+  attributes :content
+end

test/unit/active_model/serializer/has_many_test.rb

@@ -0,0 +1,63 @@
+require 'test_helper'
+require 'active_model/serializer'
+
+module ActiveModel
+  class Serializer
+    class HasManyTest < ActiveModel::TestCase
+      def setup
+        @post = Post.new({ title: 'Title 1', body: 'Body 1', date: '1/1/2000' })
+        @post_serializer = PostSerializer.new(@post)
+        @post_serializer.class._associations[0].include = false
+        @post_serializer.class._associations[0].embed = :ids
+      end
+
+      def test_associations_definition
+        associations = @post_serializer.class._associations
+
+        assert_equal 1, associations.length
+        assert_kind_of Association::HasMany, associations[0]
+        assert_equal 'comments', associations[0].name
+      end
+
+      def test_associations_embedding_ids_serialization_using_serializable_hash
+        assert_equal({
+          'title' => 'Title 1', 'body' => 'Body 1', 'comment_ids' => @post.comments.map { |c| c.object_id }
+        }, @post_serializer.serializable_hash)
+      end
+
+      def test_associations_embedding_ids_serialization_using_as_json
+        assert_equal({
+          'title' => 'Title 1', 'body' => 'Body 1', 'comment_ids' => @post.comments.map { |c| c.object_id }
+        }, @post_serializer.as_json)
+      end
+
+      def test_associations_embedding_objects_serialization_using_serializable_hash
+        @post_serializer.class._associations[0].embed = :objects
+        assert_equal({
+          'title' => 'Title 1', 'body' => 'Body 1', 'comments' => [{ 'content' => 'C1' }, { 'content' => 'C2' }]
+        }, @post_serializer.serializable_hash)
+      end
+
+      def test_associations_embedding_objects_serialization_using_as_json
+        @post_serializer.class._associations[0].embed = :objects
+        assert_equal({
+          'title' => 'Title 1', 'body' => 'Body 1', 'comments' => [{ 'content' => 'C1' }, { 'content' => 'C2' }]
+        }, @post_serializer.as_json)
+      end
+
+      def test_associations_embedding_ids_including_objects_serialization_using_serializable_hash
+        @post_serializer.class._associations[0].include = true
+        assert_equal({
+          'title' => 'Title 1', 'body' => 'Body 1', 'comment_ids' => @post.comments.map { |c| c.object_id }, 'comments' => [{ 'content' => 'C1' }, { 'content' => 'C2' }]
+        }, @post_serializer.serializable_hash)
+      end
+
+      def test_associations_embedding_ids_including_objects_serialization_using_as_json
+        @post_serializer.class._associations[0].include = true
+        assert_equal({
+          'title' => 'Title 1', 'body' => 'Body 1', 'comment_ids' => @post.comments.map { |c| c.object_id }, 'comments' => [{ 'content' => 'C1' }, { 'content' => 'C2' }]
+        }, @post_serializer.as_json)
+      end
+    end
+  end
+end