wrap and cache columns for typecasting

1 files changed, 10 insertions, 0 deletions

diff --git a/activerecord/lib/active_record/attribute_methods/serialization.rb b/activerecord/lib/active_record/attribute_methods/serialization.rb
index 38e7bf77ef..3bc749dabf 100644
--- a/activerecord/lib/active_record/attribute_methods/serialization.rb
+++ b/activerecord/lib/active_record/attribute_methods/serialization.rb
@@ -10,6 +10,16 @@ module ActiveRecord
         self.serialized_attributes = {}
       end
 
+      class Type # :nodoc:
+        def initialize(column)
+          @column = column
+        end
+
+        def type_cast(value)
+          value.unserialized_value
+        end
+      end
+
       class Attribute < Struct.new(:coder, :value, :state)
         def unserialized_value
           state == :serialized ? unserialize : value