1 files changed, 11 insertions, 16 deletions
diff --git a/activerecord/lib/active_record/attribute_methods/time_zone_conversion.rb b/activerecord/lib/active_record/attribute_methods/time_zone_conversion.rb
index 62a3cfa9a5..2f86e32f41 100644
--- a/activerecord/lib/active_record/attribute_methods/time_zone_conversion.rb
+++ b/activerecord/lib/active_record/attribute_methods/time_zone_conversion.rb
@@ -7,30 +7,25 @@ module ActiveRecord
       extend ActiveSupport::Concern
 
       included do
-        cattr_accessor :time_zone_aware_attributes, :instance_writer => false
+        config_attribute :time_zone_aware_attributes, :global => true
         self.time_zone_aware_attributes = false
 
-        class_attribute :skip_time_zone_conversion_for_attributes, :instance_writer => false
+        config_attribute :skip_time_zone_conversion_for_attributes
         self.skip_time_zone_conversion_for_attributes = []
       end
 
       module ClassMethods
         protected
-          # Defined for all +datetime+ and +timestamp+ attributes when +time_zone_aware_attributes+ are enabled.
-          # This enhanced read method automatically converts the UTC time stored in the database to the time
+          # The enhanced read method automatically converts the UTC time stored in the database to the time
           # zone stored in Time.zone.
-          def define_method_attribute(attr_name)
-            if create_time_zone_conversion_attribute?(attr_name, columns_hash[attr_name])
-              method_body, line = <<-EOV, __LINE__ + 1
-                def _#{attr_name}
-                  cached = @attributes_cache['#{attr_name}']
-                  return cached if cached
-                  time = _read_attribute('#{attr_name}')
-                  @attributes_cache['#{attr_name}'] = time.acts_like?(:time) ? time.in_time_zone : time
-                end
-                alias #{attr_name} _#{attr_name}
-              EOV
-              generated_attribute_methods.module_eval(method_body, __FILE__, line)
+          def attribute_cast_code(attr_name)
+            column = columns_hash[attr_name]
+
+            if create_time_zone_conversion_attribute?(attr_name, column)
+              typecast             = "v = #{super}"
+              time_zone_conversion = "v.acts_like?(:time) ? v.in_time_zone : v"
+
+              "((#{typecast}) && (#{time_zone_conversion}))"
             else
               super
             end