Revert polymorphism

test/serializer_test.rb

@@ -679,95 +679,6 @@ class SerializerTest < ActiveModel::TestCase
     }, hash.as_json)
   end
 
-  class PolymorphicUser < User ; end
-
-  class PolymorphicUserSerializer < ActiveModel::Serializer
-    attributes :first_name, :last_name
-  end
-
-  def test_polymorphic_has_one
-    polymorphic_blog = Class.new do
-      attr_accessor :writer
-    end
-
-    polymorphic_serializer = Class.new(ActiveModel::Serializer) do
-      has_one :writer, :polymorphic => true
-    end
-
-    user = PolymorphicUser.new
-    blog = polymorphic_blog.new
-    blog.writer = user
-
-    serializer = polymorphic_serializer.new(blog, user)
-
-    assert_equal({
-      :polymorphic_user => {
-        :first_name => "Jose",
-        :last_name => "Valim"
-      }
-    }, serializer.as_json)
-  end
-
-  def test_polymorphic_has_one_with_nil
-    polymorphic_blog = Class.new do
-      attr_accessor :writer
-    end
-
-    polymorphic_serializer = Class.new(ActiveModel::Serializer) do
-      has_one :writer, :polymorphic => true
-    end
-
-    user = PolymorphicUser.new
-    blog = polymorphic_blog.new
-    blog.writer = nil
-
-    serializer = polymorphic_serializer.new(blog, user)
-
-    assert_equal({
-    }, serializer.as_json)
-  end
-
-  def test_polymorphic_has_one_with_ids
-    polymorphic_blog = Class.new do
-      attr_accessor :writer
-    end
-
-    polymorphic_serializer = Class.new(ActiveModel::Serializer) do
-      embed :ids
-      has_one :writer, :polymorphic => true
-    end
-
-    user = PolymorphicUser.new :id => 1
-    blog = polymorphic_blog.new
-    blog.writer = user
-
-    serializer = polymorphic_serializer.new(blog, user)
-
-    assert_equal({
-      :polymorphic_user => 1
-    }, serializer.as_json)
-  end
-
-  def test_polymorphic_has_one_id_with_nil
-    polymorphic_blog = Class.new do
-      attr_accessor :writer
-    end
-
-    polymorphic_serializer = Class.new(ActiveModel::Serializer) do
-      embed :ids
-      has_one :writer, :polymorphic => true
-    end
-
-    user = PolymorphicUser.new
-    blog = polymorphic_blog.new
-    blog.writer = nil
-
-    serializer = polymorphic_serializer.new(blog, user)
-
-    assert_equal({
-    }, serializer.as_json)
-  end
-
   def test_root_provided_in_options
     author_serializer = Class.new(ActiveModel::Serializer) do
       attributes :id, :name