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

@@ -1,8 +1,10 @@
 # encoding: UTF-8
 module MongoMapper
   module Plugins
     module Indexes
+      extend ActiveSupport::Concern
+
       module ClassMethods
         def ensure_index(spec, options={})
           collection.create_index(spec, options)
         end
       end
\ No newline at end of file