SUGAR CRM 7: Updating Model inside Ajax

var self = this;
// more logic here
$.ajax({
    beforeSend: function (request) {
        request.setRequestHeader("OAuth-Token", your token);
    },
    type: "PUT",
    data: JSON.stringify({"status": "Closed"}),
    dataType: "json",
    url: 'your url',
    success: function (data)
    {
        // more logic here
        self.model.set('status', 'Closed');
    }
});