Rails模型进行哈希处理，排除属性 [英] Rails model to hash, exclude attributes

问题描述

我正在尝试形成如下所示的json响应:

I am trying to form a json response that looks like this:

{
  "user": {
    "birthday": "2013-03-13",
    "email": "example@example",
    "id": 1,
    "name": null,
    "username": "example"
  },
   "other_data": "foo"
}

以前，当我刚刚返回用户时，我曾经使用过

Before, when I was just returning the user, I used

render :json => @user, :except => [:hashed_password, :created_at, :updated_at]

防止发送hashed_pa​​ssword，created_at和updated_at属性.有没有办法做到这一点，但还允许其他数据与用户一起发送?现在，我只是将要发送给哈希的属性一一添加，但这显然不理想.

to keep the hashed_password, created_at, and updated_at attributes from being sent. Is there a way to do this, but also allow additional data to be sent along with the user? Right now I'm just adding the attributes I want to send to the hash one by one, but this is obviously not ideal.

推荐答案

首先呈现json数据会自动在模型上调用'as_json'，这会返回一个ruby哈希.之后，在此调用'to_json'以获得哈希的字符串表示形式.

Rendering json data first automagically calls 'as_json' on your model, which returns a ruby hash. After that, 'to_json' is called on that to get a string representation of your hash.

要实现您想要的目标，可以调用以下名称:

To achieve what you wanted, you can call something like this:

render :json => {
  :user => @user.as_json(:except => [:hashed_password]),
  :some_other_data => {}
}

在这种情况下，没有对象响应"as_json"，因此控制器仅调用"to_json"将您的哈希值转换为字符串.

In this case, there is no object which responds to 'as_json', so the controller just calls 'to_json' to turn your hash to a string.

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