ruby-on-rails - rails : Pretty print JSON without overkill

Question

我正在使用以下代码在 JSON 中显示未经授权的消息:

def render_unauthorized
  # Displays the Unauthorized message since the user did
  # not pass proper authentication parameters.
  self.headers['WWW-Authenticate'] = 'Token realm="API"'
  render json: { 
    error: { 
      type: "unauthorized",
      message: "This page cannot be accessed without a valid API key." 
      } 
    }, status: 401
end

哪些输出:

{"error":{"type":"unauthorized","message":"This page cannot be accessed without a valid API key."}}

所以我的问题是:有没有办法漂亮地打印这条消息 (无需将其放在单独的 View 中并使用一些 3rd 方 gem )。

编辑:什么是 pretty-print ？

适当间隔，以及..漂亮。这是我想看到的输出:

{
  "error": {
    "type": "unauthorized",
    "message": "This page cannot be accessed without a valid API key." 
  }
}

解决方案

使用@emaillenin 下面的回答有效。为了记录，这里是最终代码的样子(因为他没有包括整个事情):

def render_unauthorized
  # Displays the Unauthorized message since the user did
  # not pass proper authentication parameters.
  self.headers['WWW-Authenticate'] = 'Token realm="API"'
  render json: JSON.pretty_generate({ # <-- Here it is :')
    error: { 
      type: "unauthorized",
      message: "This page cannot be accessed without a valid API key." 
      } 
    }), status: 401
end

Answer 1

使用 JSON 中内置的这个辅助方法。

JSON.pretty_generate

我刚试过，它有效:

> str = '{"error":{"type":"unauthorized","message":"This page cannot be accessed without a valid API key."}}'
> JSON.pretty_generate(JSON.parse(str))
 => "{\n  \"error\": {\n    \"type\": \"unauthorized\",\n    \"message\": \"This page cannot be accessed without a valid API key.\"\n  }\n}"