懂cakephp的帮忙看一下这段cakephp的代码,为什么AuthComponent:user('id')取不到值,该怎么解决

懂cakephp的帮忙看一下这段cakephp的代码,为什么AuthComponent::user('id')取不到值

PHP code

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-->function login(){
        if(empty($this->request->data['User']['username']) or empty($this->request->data['User']['password'])){
            $this->Session->setFlash('Please intyped a valied account!');
        }elseif ($this->Auth->login($this->request->data['User'])) {
            $this->User->id= AuthComponent::user('id');
            $this->redirect("/users/index");    
        }
        else{                
                $this->redirect("/users/logout");    
            }    
        }

------解决方案--------------------
没放到session里面
------解决方案--------------------
一般是这样去获取用户的信息的
$this->Auth->user();
自己试下，
我的用法是这样
1.在AppController中beforeFilter中设置$this->Auth相关属性
2.在UsersController中
function login(){
if($this->Auth->login()){
$this->redirect($this->Auth->redirect());
}
///.....
}