在Rails 3中过滤json渲染

Question

so i have this piece of code:

 render :json => { :objects => @object.object_children }

This works. But What I only want are certain attributes only. I saw this: filter json render in rails 3 and in it is this:

respond_to do |format|
format.json { render json: @objects.object_children, :only => [:id, :name] }
end

It works, but it returns data without a label, just like this:

id":null,"name":"foo"

I want the ":objects =>" label in it. Thanks

Answer 1

对于高级json序列化，请查看Active Model序列化器

Answer 2

You have to combine your original solution with the one you found:

render :json => { :objects => @object.object_children.as_json(:only => [:id, :name]) }

EDIT: Explanation

In your original solution you're adding the key :objects => manually to the response.

render :json => @object.object_children
# vs
render :json => { :objects => @object.object_children }

So to add the key and filter the returned attributes you have to do the same but then call as_json (that's what Rails would do for simply returning the whole collection) manually with the :only option to apply the filter.

If you use the respond_to block depends on your needs.