# File lib/couch_potato/persistence/deep_dirty_attributes.rb, line 20
      def changes
        changes = super
        if @original_deep_values
          self.class.deep_tracked_properties.each do |property|
            if send("#{property.name}_changed?")
              changes[property.name] = send("#{property.name}_change")
            else
              changes.delete property.name
            end
          end
        end
        changes
      end