Rails 3 put data through jquey ajax

jquery-put-data-rails

In gemfile add,
gem "json"

In javascript file,
var path ="/branches/8/student/154;
$.ajax({
  type: "PUT",
  url: path,
  data: { student : JSON.stringify( {name : "deepak", last_name : "dargade"} ) },
  dataType: 'json',
  success: function(msg) {
     alert( "Data Saved: " + msg );
  }
});


In controller,

def update
  params[:student] = JSON.parse params[:student]  if params[:student].is_a? String
  ....
  ....
  end