    # File lib/action_controller/caching.rb, line 188
          def expire_action(options = {})
            return unless perform_caching
            if options[:action].is_a?(Array)
              options[:action].dup.each do |action|
                expire_fragment(ActionCachePath.path_for(self, options.merge({ :action => action })))
              end
            else
              expire_fragment(ActionCachePath.path_for(self, options))
            end
          end