Spec for linked resource type name demodulization

test/adapter/json_api/belongs_to_test.rb

@@ -64,7 +64,7 @@ module ActiveModel
             assert_equal({comments: [], author: nil}, adapter.serializable_hash[:posts][:links])
           end
 
-          def test_include_type_for_association_when_is_different_than_name
+          def test_include_type_for_association_when_different_than_name
             serializer = BlogSerializer.new(@blog)
             adapter = ActiveModel::Serializer::Adapter::JsonApi.new(serializer)
             links = adapter.serializable_hash[:blogs][:links]

test/adapter/json_api/has_many_test.rb

@@ -78,10 +78,15 @@ module ActiveModel
             assert_nil adapter.serializable_hash[:linked]
           end
 
-          def test_include_type_for_association_when_is_different_than_name
+          def test_include_type_for_association_when_different_than_name
             serializer = BlogSerializer.new(@blog)
             adapter = ActiveModel::Serializer::Adapter::JsonApi.new(serializer)
-            assert_equal({type: "posts", ids: ["1"]}, adapter.serializable_hash[:blogs][:links][:articles])
+            actual = adapter.serializable_hash[:blogs][:links][:articles]
+            expected = {
+              type: "posts",
+              ids: ["1"]
+            }
+            assert_equal(expected, actual)
           end
         end
       end

test/adapter/json_api/linked_test.rb

@@ -138,6 +138,21 @@ module ActiveModel
             }
             assert_equal expected, @adapter.serializable_hash[:linked]
           end
+
+          def test_ignore_model_namespace_for_linked_resource_type
+            spammy_post = Post.new(id: 123)
+            spammy_post.related = [Spam::UnrelatedLink.new(id: 456)]
+            serializer = SpammyPostSerializer.new(spammy_post)
+            adapter = ActiveModel::Serializer::Adapter::JsonApi.new(serializer)
+            links = adapter.serializable_hash[:posts][:links]
+            expected = {
+              related: {
+                type: 'unrelated_links',
+                ids: ['456']
+              }
+            }
+            assert_equal expected, links
+          end
         end
       end
     end

test/fixtures/poro.rb

@@ -47,6 +47,8 @@ Author = Class.new(Model)
 Bio = Class.new(Model)
 Blog = Class.new(Model)
 Role = Class.new(Model)
+module Spam; end
+Spam::UnrelatedLink = Class.new(Model)
 
 PostSerializer = Class.new(ActiveModel::Serializer) do
   attributes :title, :body, :id
@@ -56,6 +58,15 @@ PostSerializer = Class.new(ActiveModel::Serializer) do
   url :comments
 end
 
+SpammyPostSerializer = Class.new(ActiveModel::Serializer) do
+  attributes :id
+  has_many :related
+
+  def self.root_name
+    'posts'
+  end
+end
+
 CommentSerializer = Class.new(ActiveModel::Serializer) do
   attributes :id, :body
 
@@ -123,3 +134,7 @@ PostPreviewSerializer = Class.new(ActiveModel::Serializer) do
   has_many :comments, serializer: CommentPreviewSerializer
   belongs_to :author, serializer: AuthorPreviewSerializer
 end
+
+Spam::UnrelatedLinkSerializer = Class.new(ActiveModel::Serializer) do
+  attributes :id
+end