adapter.rb in pickle-0.2.10

- old
+ new

@@ -1,5 +1,7 @@
+require 'active_support/core_ext'
+
 module Pickle
   # Abstract Factory adapter class, if you have a factory type setup, you
   # can easily create an adaptor to make it work with Pickle.
   #
   # The factory adaptor must have a #factories class method that returns 
@@ -13,10 +15,15 @@
     
     def create(attrs = {})
       raise NotImplementedError, "create and return an object with the given attributes"
     end
   
-    cattr_writer :model_classes
+    if respond_to?(:class_attribute)
+      class_attribute :model_classes
+    else
+      cattr_writer :model_classes
+    end
+    
     self.model_classes = nil
     
     class << self
       def factories
         raise NotImplementedError, "return an array of factory adapter objects"
\ No newline at end of file