# File lib/dragonfly/active_model_extensions/class_methods.rb, line 79
      def dragonfly_attachment_classes
        @dragonfly_attachment_classes ||= begin
          parent_class = ancestors.select{|a| a.is_a?(Class) }[1]
          if parent_class.respond_to?(:dragonfly_attachment_classes)
            parent_class.dragonfly_attachment_classes.map do |klass|
              new_dragonfly_attachment_class(klass.attribute, klass.app, klass.config_block)
            end
          else
            []
          end
        end
      end