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，所有这些都是一个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"，或者尝试失败并找不到HTML模板，或者返回406.我只希望它自动且始终呈现JSON，例如从RABL或JBuilder视图中.

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

您可以在控制器中添加before_filter，以将请求格式设置为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.如果要允许其他格式，则可以在设置request.format时检查format参数是否存在，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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