fragment_for

# File actionpack/lib/action_controller/caching/fragments.rb, line 37
      def fragment_for(buffer, name = {}, options = nil, &block) #:nodoc:
        if perform_caching
          if cache = read_fragment(name, options)
            buffer.safe_concat(cache.html_safe)
          else
            pos = buffer.length
            block.call
            write_fragment(name, buffer[pos..-1], options)
          end
        else
          block.call
        end
      end