Laravel Ajax Filter for Controllers

ajax-filter.php

<?php 
//This part would be included in the controller itself like so:
class Articles_Controller extends Controller {

	public function __construct() {
		parent::__construct();

		$this->filter('before', 'csrf')->on('post');
		$this->filter('before', 'ajax')->only(array('index', 'show', 'update'));
	}

}

//This part would go in the route.php
Route::filter('ajax', function() {
	if (Request::ajax() === false)
		return Response::error('500');
});