轨道3的respond_to JSON，具有自定义属性/方法 [英] Rails 3 respond_to json, with custom attributes/methods

问题描述

在一个Rails应用程序我有一个返回不同型号的集合的JSON重新presentation一个动作。它看起来的的东西的是这样的：

In a rails app I have an action that returns a json representation of a collection of different models. It looks something like this:

respond_to :json

def index
  @cars = Car.all
  @vans = Van.all
  respond_with({
    :cars => @cars,
    :vans => @vans
  })
end

不过，我想自定义传递给JSON对象的属性和方法。好像有点：

However, I want to customise the attributes and methods that are passed to the json object. A bit like:

respond_with({
  :cars => @cars.to_json(:only => [:make, :model], :methods => [:full_name]),
  :vans => @vans
})

做好以上，导致的车被转义为一个大的字符串的JSON重新presentation，如：

Doing the above, causes the json representation of the "cars" to be escaped as one big string, like:

{
  "cars":"[{\"car\":{\"make\":\"Ford\"  ... etc
  "vans": [{"van":{"make":"Citreon"  ... vans not escaped
}

很显然，我这接近了错误的方式。任何人都可以点我朝着正确的方向？

Obviously I'm approaching this the wrong way. Can anyone point me in the right direction?

推荐答案

既然你嵌套 to_json 在另一散列，我认为你需要使用 as_json （返回散列，而不是字符串）代替：

Since you're nesting the to_json in another Hash, I think you need to use as_json (which returns a Hash instead of a String) instead:

respond_with({
  :cars => @cars.as_json(:only => [:make, :model], :methods => [:full_name]),
  :vans => @vans
})

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