问Cakephp auth:将错误消息绑定到作用域条件

EN

public function login()
{
    if ($this->request->is('post')) {
        if ($this->Auth->login($this->data['User'])) {
            // check activated field
            if ($this->Auth->user('activated') == 1) {
                // user is activated
                $this->redirect(...);
            } else {
                // user is not activated
                // log the user out
                $this->Auth->logout();
                // redirect to an error page for inactive users
                $this->redirect(..);
            }
        }
        // redirect to an error page for wrong username/password
        $this->redirect(..);
    }
}