Rails 3：如何在 JSON 请求中返回错误？
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Rails 3: How to return errors in a JSON request?
提问by donald
How can I return a 800, 404, etc error when a user makes a JSON/XML request to my API?
当用户向我的 API 发出 JSON/XML 请求时，如何返回 800、404 等错误？
I've tried
我试过了
error 404, {:error => "ERror".to_json }
with no success.
没有成功。
Also, I've tried to put a "respond_to" but it doesn't work as well (it duplicates the respond_to and gives error).
另外，我尝试放置一个“respond_to”，但效果不佳（它复制了respond_to并给出了错误）。
Thanks
谢谢
回答by oma
The same way you return such errors with html, it's part of the HTTP Header.
与使用 html 返回此类错误的方式相同，它是 HTTP 标头的一部分。
render json: @myobject, status: :unprocessable_entity
Update, response to comment:
更新，回复评论：
You can get all the status codes from Rack. Rails passes the symbolized status to Rack
您可以从 Rack 获取所有状态代码。Rails 将符号状态传递给 Rack
Rack::Utils.status_code(options[:status])
which simply matches the symbol to the list of status (the strings are converted to symbols) Here is the smoking fresh list: https://github.com/rack/rack/blob/master/lib/rack/utils.rb#L575-L638
它只是将符号与状态列表匹配（字符串被转换为符号）这是吸烟新鲜列表：https: //github.com/rack/rack/blob/master/lib/rack/utils.rb#L575 -L638
Scroll a bit lower and you'll see the status_codemethod. It's fun to read the source code!
向下滚动一点，您将看到该status_code方法。阅读源代码很有趣！
