Allow YAML serialization when using TZ aware attributes

activerecord/lib/active_record/attribute_methods/time_zone_conversion.rb

@@ -2,6 +2,8 @@ module ActiveRecord
   module AttributeMethods
     module TimeZoneConversion
       class TimeZoneConverter < SimpleDelegator # :nodoc:
+        include Type::Decorator
+
         def type_cast_from_database(value)
           convert_time_to_time_zone(super)
         end

activerecord/lib/active_record/type.rb

@@ -1,3 +1,4 @@
+require 'active_record/type/decorator'
 require 'active_record/type/mutable'
 require 'active_record/type/numeric'
 require 'active_record/type/time_value'

activerecord/lib/active_record/type/decorator.rb

@@ -0,0 +1,14 @@
+module ActiveRecord
+  module Type
+    module Decorator # :nodoc:
+      def init_with(coder)
+        @subtype = coder['subtype']
+        __setobj__(@subtype)
+      end
+
+      def encode_with(coder)
+        coder['subtype'] = __getobj__
+      end
+    end
+  end
+end

activerecord/lib/active_record/type/serialized.rb

@@ -2,6 +2,7 @@ module ActiveRecord
   module Type
     class Serialized < SimpleDelegator # :nodoc:
       include Mutable
+      include Decorator
 
       attr_reader :subtype, :coder
 
@@ -36,14 +37,13 @@ module ActiveRecord
       end
 
       def init_with(coder)
-        @subtype = coder['subtype']
         @coder = coder['coder']
-        __setobj__(@subtype)
+        super
       end
 
       def encode_with(coder)
-        coder['subtype'] = @subtype
         coder['coder'] = @coder
+        super
       end
 
       private

activerecord/test/cases/attribute_methods_test.rb

@@ -681,6 +681,14 @@ class AttributeMethodsTest < ActiveRecord::TestCase
     end
   end
 
+  def test_yaml_dumping_record_with_time_zone_aware_attribute
+    in_time_zone "Pacific Time (US & Canada)" do
+      record = Topic.new(id: 1)
+      record.written_on = "Jan 01 00:00:00 2014"
+      assert_equal record, YAML.load(YAML.dump(record))
+    end
+  end
+
   def test_setting_time_zone_conversion_for_attributes_should_write_value_on_class_variable
     Topic.skip_time_zone_conversion_for_attributes = [:field_a]
     Minimalistic.skip_time_zone_conversion_for_attributes = [:field_b]