Rails 3 respond_to json, with custom attributes/methods

问题:

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 

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 }) 

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 } 

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

回答1:

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 }) 

文章来源: Rails 3 respond_to json, with custom attributes/methods