# File lib/mongo_mapper/plugins/userstamps.rb, line 8
        def userstamps!(options = {})
          class_name = (options[:class_name] || options[:class] || 'User' ).to_s
          key :creator_id, ObjectId
          key :updater_id, ObjectId
          belongs_to :creator, :class_name => class_name
          belongs_to :updater, :class_name => class_name
        end