lib/mongo_mapper/plugins/userstamps.rb in mongo_mapper-0.8.6 vs lib/mongo_mapper/plugins/userstamps.rb in mongo_mapper-0.9.0

@@ -1,8 +1,10 @@
 # encoding: UTF-8
 module MongoMapper
   module Plugins
     module Userstamps
+      extend ActiveSupport::Concern
+
       module ClassMethods
         def userstamps!
           key :creator_id, ObjectId
           key :updater_id, ObjectId
           belongs_to :creator, :class_name => 'User'
\ No newline at end of file