Rails 4 - 无论请求的格式如何，如何呈现 JSON? [英] Rails 4 - How to render JSON regardless of requested format?

问题描述

我想要一个 Rails 控制器(实际上，它们都是一个 API)来始终呈现 JSON.

I'd like a Rails controller (all of them, actually, it's an API) to render JSON always always.

我不希望 Rails 返回找不到路由"，或者尝试但找不到 HTML 模板，或者返回 406.我只希望它自动并始终呈现 JSON，例如从 RABL 或 JBuilder 视图.

I don't want Rails to return "route not found", or try and fail to find an HTML template, or return 406. I just want it to automatically and always render JSON, e.g. from a RABL or JBuilder view.

这可能吗?相关问题的答案似乎具有上述缺点.

Is this possible? Related questions seem to have answers that have the aforementioned downsides.

推荐答案

你可以在你的控制器中添加一个before_filter来设置请求格式为json:

You can add a before_filter in your controller to set the request format to json:

# app/controllers/foos_controller.rb

before_action :set_default_response_format

protected

def set_default_response_format
  request.format = :json
end

这会将所有响应格式设置为 json.如果您想允许其他格式，您可以在设置 request.format 时检查是否存在 format 参数，例如:

This will set all response format to json. If you want to allow other formats, you could check for the presence of format parameter when setting request.format, for e.g:

def set_default_response_format
  request.format = :json unless params[:format]
end

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