instance method fragment_name_with_digest

# File actionview/lib/action_view/helpers/cache_helper.rb, line 221
      def fragment_name_with_digest(name, virtual_path)
        virtual_path ||= @virtual_path

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

          if digest = Digestor.digest(name: virtual_path, finder: lookup_context, dependencies: view_cache_dependencies).presence
            [ "#{virtual_path}:#{digest}", name ]
          else
            [ virtual_path, name ]
          end
        else
          name
        end
      end