fragment_name_with_digest

# File actionview/lib/action_view/helpers/cache_helper.rb, line 231
      def fragment_name_with_digest(name, virtual_path, digest_path)
        virtual_path ||= @virtual_path

        if virtual_path || digest_path
          name = controller.url_for(name).split("://").last if name.is_a?(Hash)

          digest_path ||= digest_path_from_template(@current_template)

          [ digest_path, name ]
        else
          name
        end
      end