How to render JSON in rhodes mobile framework

Currently I am using Rhodes framework to build mobile applications. Recently I just figured out how to request an Ajax call from view, and controller how to render a JSON object and return it to the view.

Sample code
Ajax call to request json object using jQuery:

	$.getJSON(<%= url_for :action => :request_json %>, function(data) {
	alert(data.a);
	alert(data.b);
	});

view raw rhodes_request_json hosted with ❤ by GitHub

code of rending json in controller

	def request_json
	@response['headers']['Content-Type']='application/json'
	obj = {"a" => 1, "b"=> 2}
	result = obj.to_json
	render :string => result, :use_layout_on_ajax => true
	end

view raw rhodes_rendering_json hosted with ❤ by GitHub

I found this solution in the Rhomobile launchpad forum, it works perfectly.
This exactly looks like render json behaviour in Ruby on Rails.