Refactor serialized types to be partially defined as custom properties

Many of the methods defined in `AttributeMethods::Serialization` can be
refactored onto this type as well, but this is a reasonable small step.
Removes the `Type` class, and the need for `decorate_columns` to handle
serialized types.

2 files changed, 2 insertions, 12 deletions

diff --git a/activerecord/test/cases/attribute_methods/serialization_test.rb b/activerecord/test/cases/attribute_methods/serialization_test.rb
index 75de773961..2e3bcadab1 100644
--- a/activerecord/test/cases/attribute_methods/serialization_test.rb
+++ b/activerecord/test/cases/attribute_methods/serialization_test.rb
@@ -14,13 +14,13 @@ module ActiveRecord
 
       def test_type_cast_serialized_value
         value = Serialization::Attribute.new(NullCoder.new, "Hello world", :serialized)
-        type = Serialization::Type.new(FakeColumn.new)
+        type = Type::Serialized.new(FakeColumn.new)
         assert_equal "Hello world!", type.type_cast(value)
       end
 
       def test_type_cast_unserialized_value
         value = Serialization::Attribute.new(nil, "Hello world", :unserialized)
-        type = Serialization::Type.new(FakeColumn.new)
+        type = Type::Serialized.new(FakeColumn.new)
         type.type_cast(value)
         assert_equal "Hello world", type.type_cast(value)
       end
diff --git a/activerecord/test/cases/serialized_attribute_test.rb b/activerecord/test/cases/serialized_attribute_test.rb
index c8f9d7cf87..c65a86a6ef 100644
--- a/activerecord/test/cases/serialized_attribute_test.rb
+++ b/activerecord/test/cases/serialized_attribute_test.rb
@@ -235,16 +235,6 @@ class SerializedAttributeTest < ActiveRecord::TestCase
     assert_equal [], light.long_state
   end
 
-  def test_serialized_column_should_not_be_wrapped_twice
-    Topic.serialize(:content, MyObject)
-
-    myobj = MyObject.new('value1', 'value2')
-    Topic.create(content: myobj)
-    Topic.create(content: myobj)
-    type = Topic.column_types["content"]
-    assert !type.instance_variable_get("@column").is_a?(ActiveRecord::AttributeMethods::Serialization::Type)
-  end
-
   def test_serialized_column_should_unserialize_after_update_column
     t = Topic.create(content: "first")
     assert_equal("first", t.content)