Ruby-on-rails 在 Rails 3 中，respond_to 和 format.all 的工作方式与 Rails 2 不同吗？
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In Rails 3, respond_to and format.all works differently than Rails 2?
提问by nonopolarity
the code
编码
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
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."
以上将在 Rails 2.2.2 中工作。但是在 Rails 3 中，在浏览器上获取 controller/index.html 或 index 都会落入最后一行：“目前仅支持 HTML 和 JSON 格式。”
The only Rails doc I can find on this is
我能找到的唯一 Rails 文档是
which current only states:
目前仅声明：
respond_to :html, :xml, :json
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.
但是他们需要单独的 json 和 xml 模板，并且无法处理“目前仅支持 HTML 和 JSON 格式”的情况。
回答by nathanvda
In rails3 you would write:
在 rails3 你会写：
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
But this only works in correspondence with a respond_toblock at the top of the file, detailing the expected formats. E.g.
但这仅适用于respond_to文件顶部的块，详细说明了预期的格式。例如
respond_to :xml, :json, :html
Even in that case, if anybody for instance asks the jsformat, the anyblock is triggered.
即使在这种情况下，如果有人询问js格式，any就会触发块。
You could also still use the respond_toalone, as follows:
您也可以respond_to单独使用，如下所示：
@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
Hope this helps.
希望这可以帮助。
回答by svilenv
You may find it useful to watch this episode of railscasts, which illustrates the changes to controllers in Rails 3 and in particular the changes to the responder class (putting respond_to in the controller class itself and only using respond_with @object in the action):
您可能会发现观看 Railscast 的这一集很有用，它说明了 Rails 3 中控制器的更改，特别是响应器类的更改（将 respond_to 放在控制器类本身中，并且仅在操作中使用 respond_with @object）：
回答by dreeves
The following works for me. I believe you have to specify the "render" part for html explicitly or it will use the format.any.
以下对我有用。我相信您必须明确指定 html 的“渲染”部分，否则它将使用 format.any。
respond_to do |format|
format.html { render :html => @switches }
format.json { render :json => @switches }
format.xml { render :xml => @switches }
format.all { render :text => "we only have html, json, and xml" }
end
