在ruby中不使用xml呈现时刷新

在尝试在rest系统中实现对有条件获取的支持时，我们遇到了新鲜和过时的问题？方法

以下代码适用于304，不需要进一步渲染： 如果过时（：etag=>resource，：last\u modified=>resource.updated\u at.utc） 回应待办事项|格式| format.html#show.html.erb } 终止 结束

但是访问1.xml将尝试呈现资源两次：

if stale?(:etag => resource, :last_modified => resource.updated_at.utc)
  respond_to do |format|
    format.html # show.html.erb
    format.xml  { 
      render :xml => @order.to_xml(:controller => self, :except => [:paid_at]) 
      }
  end
end

错误消息：

ActionController:：OrdersController中的DoubleRenderError#显示

每个操作只能渲染或重定向一次

RAILS\u ROOT:/Users/guilherme/Documents/ruby/restfulie测试 应用程序跟踪|框架跟踪|完整跟踪

/Library/Ruby/Gems/1.8/Gems/actionpack-2.3.4/lib/action\u controller/base.rb:900:in

render\u而不使用\u benchmark'
/Library/Ruby/Gems/1.8/Gems/actionpack-2.3.4/lib/action\u controller/benchmarking.rb:51:in

render' /Library/Ruby/Gems/1.8/Gems/activesupport-2.3.4/lib/active\u support/core\u ext/benchmark.rb:17:in

ms'
/Library/Ruby/Gems/1.8/Gems/activesupport-2.3.4/lib/active\u support/core\u ext/benchmark.rb:10:in

realtime' /Library/Ruby/Gems/1.8/Gems/activesupport-2.3.4/lib/active\u support/core\u ext/benchmark.rb:17:in

ms'
/Library/Ruby/Gems/1.8/Gems/actionpack-2.3.4/lib/action\u controller/benchmarking.rb:51:in

render' /Library/Ruby/Gems/1.8/Gems/actionpack-2.3.4/lib/action\u controller/base.rb:1331:in

send'
/Library/Ruby/Gems/1.8/Gems/actionpack-2.3.4/lib/action\u controller/base.rb:1331:in

不使用过滤器执行操作' /Library/Ruby/Gems/1.8/Gems/actionpack-2.3.4/lib/action\u controller/filters.rb:617:in

call\u filters'
/Library/Ruby/Gems/1.8/Gems/actionpack-2.3.4/lib/action\u controller/filters.rb:610:in

perform\u action\u而不使用\u benchmark' /Library/Ruby/Gems/1.8/Gems/actionpack-2.3.4/lib/action\u controller/benchmarking.rb:68:in

perform\u action\u
/Library/Ruby/Gems/1.8/Gems/activesupport-2.3.4/lib/active\u support/core\u ext/benchmark.rb:17:in

ms' /Library/Ruby/Gems/1.8/Gems/activesupport-2.3.4/lib/active\u support/core\u ext/benchmark.rb:10:in

realtime'
/Library/Ruby/Gems/1.8/Gems/activesupport-2.3.4/lib/active\u support/core\u ext/benchmark.rb:17:in

ms' /Library/Ruby/Gems/1.8/Gems/actionpack-2.3.4/lib/action\u controller/benchmarking.rb:68:in

perform\u action\u
/Library/Ruby/Gems/1.8/Gems/actionpack-2.3.4/lib/action\u controller/rescue.rb:160:in

不使用flash执行动作 /Library/Ruby/Gems/1.8/Gems/actionpack-2.3.4/lib/action\u controller/flash.rb:146:in

perform\u action'
/Library/Ruby/Gems/1.8/Gems/actionpack-2.3.4/lib/action\u controller/base.rb:532:in

send' /Library/Ruby/Gems/1.8/Gems/actionpack-2.3.4/lib/action\u controller/base.rb:532:in

process\u无过滤器
/Library/Ruby/Gems/1.8/Gems/actionpack-2.3.4/lib/action_controller/filters.rb:606:in

process' /Library/Ruby/Gems/1.8/Gems/actionpack-2.3.4/lib/action\u controller/base.rb:391:in

process'
/Library/Ruby/Gems/1.8/Gems/actionpack-2.3.4/lib/action\u controller/base.rb:386:in

call' /Library/Ruby/Gems/1.8/Gems/actionpack-2.3.4/lib/action\u controller/routing/route\u set.rb:437:in'call'

有什么建议吗

---

关于

我不确定你是否找到了这个问题的解决方案，但我只是在渲染js时遇到了同样的问题

我找到的解决方案是使用相反的方法：

def index
  if stale?(:etag => [request.host],
            :public => true)
    respond_to do |format|
      format.js
    end
  end
end

---

当然，将[request.host]替换为您用来确定新鲜度的任何东西。

为什么要将

：controller=>self

传递给

to_xml

？Restfulie。。。github.com/caelum/restfulie