在Rails 3中，response_to和format.all的工作原理与Rails 2不同吗? [英] In Rails 3, respond_to and format.all works differently than Rails 2?

问题描述

代码

respond_to do |format|
  format.html
  format.json { render :json => @switches }
  format.xml { render :xml => @switches.to_xml }
  format.all { render :text => "only HTML, XML, and JSON format are supported at the moment." }
end

以上内容将在Rails 2.2.2中运行.但是在Rails 3中，在浏览器上获取controller/index.html或index都将落在最后一行:目前仅支持HTML和JSON格式."

the above will work in Rails 2.2.2. But in Rails 3, getting controller/index.html or index on the browser will both fall into the last line: "only HTML and JSON format are supported at the moment."

我唯一可以找到的Rails文档是

The only Rails doc I can find on this is

http://api.rubyonrails.org/classes/ActionController/MimeResponds/ClassMethods.html#method-i-respond_to

当前仅指出:

respond_to :html, :xml, :json

但是它们需要用于json和xml的单独模板，并且无法处理目前仅支持HTML和JSON格式"的情况.

but they need separate templates for json and xml, and can't handle the "only HTML and JSON format are supported at the moment" case.

推荐答案

在rails3中，您应该编写:

In rails3 you would write:

respond_with(@switches) do |format|
  format.html
  format.json { render :json => @switches }
  format.xml  { render :xml  => @switches }
  format.all  { render :text => "only HTML, XML, and JSON format are supported at the moment." }
end

但这仅与文件顶部的respond_to块相对应，详细说明了预期的格式.例如

But this only works in correspondence with a respond_to block at the top of the file, detailing the expected formats. E.g.

respond_to :xml, :json, :html

即使在这种情况下，例如，如果有人要求使用js格式，也会触发any块.

Even in that case, if anybody for instance asks the js format, the any block is triggered.

您还可以单独使用respond_to，如下所示:

You could also still use the respond_to alone, as follows:

@switches = ...
respond_to do |format|
  format.html {render :text => 'This is html'}
  format.xml  {render :xml  => @switches}
  format.json {render :json => @switches}
  format.all  {render :text => "Only HTML, JSON and XML are currently supported"}
end

希望这会有所帮助.

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