public function action_update($id)
    {
        $tpl = Haml::Factory('admin/users/create');
        $user = ORM::Factory('user', (int) $id);

        $data = array(
            'username', 'mail', 'birthdate'
        );
        if($_POST)
        {
            foreach($data as $field)
            {
                $user->$field = $_POST[$field];
            }

            if(!empty($_POST['password']))
                {
                var_dump($_POST);
                $user->password = $_POST['password'];
                }

            $user->birthdate = date("Y-m-d", strtotime($_POST['birthdate']));

            if($user->check())
            {
                $user->save();
            }
            else
            {
                $tpl->set('errors', $user->validate()->errors('form/user'));
                $tpl->set($_POST);
            }
        }

        $tpl->set($user->as_array());

        $this->request->response = $tpl;
    }