forms - 在非对象上调用成员函数 allow() - 授权

Question

我使用了这个教程:http://book.cakephp.org/2.0/en/tutorials-and-examples/blog-auth-example/auth.html

构建我的第一个表单/创建用户应用程序，但失败并显示错误消息:

Fatal error: Call to a member function allow() on a non-object in /home/public_html/cake/app/Controller/UsersController.php on line 18

这是第 18 行:

$this->Auth->allow('add', 'logout');

上面的行是函数的成员:

public function beforeFilter() {
    parent::beforeFilter();
    $this->Auth->allow('add', 'logout');
}

我的整个 UsersController.php :

<?php
class UsersController extends AppController {

    public function login() {
        if ($this->Auth->login()) {
            $this->redirect($this->Auth->redirect());
        } else {
            $this->Session->setFlash(__('Invalid username or password, try again'));
        }
    }

    public function logout() {
        $this->redirect($this->Auth->logout());
    }

    public function beforeFilter() {
        parent::beforeFilter();
        $this->Auth->allow('add', 'logout');
    }

    public function index() {
        $this->User->recursive = 0;
        $this->set('users', $this->paginate());
    }

    public function view($id = null) {
        $this->User->id = $id;
        if (!$this->User->exists()) {
            throw new NotFoundException(__('Invalid user'));
        }
        $this->set('user', $this->User->read(null, $id));
    }

    public function add() {
        if ($this->request->is('post')) {
            $this->User->create();
            if ($this->User->save($this->request->data)) {
                $this->Session->setFlash(__('The user has been saved'));
                $this->redirect(array('action' => 'index'));
            } else {
                $this->Session->setFlash(__('The user could not be saved. Please, try again.'));
            }
        }
    }

    public function edit($id = null) {
        $this->User->id = $id;
        if (!$this->User->exists()) {
            throw new NotFoundException(__('Invalid user'));
        }
        if ($this->request->is('post') || $this->request->is('put')) {
            if ($this->User->save($this->request->data)) {
                $this->Session->setFlash(__('The user has been saved'));
                $this->redirect(array('action' => 'index'));
            } else {
                $this->Session->setFlash(__('The user could not be saved. Please, try again.'));
            }
        } else {
            $this->request->data = $this->User->read(null, $id);
            unset($this->request->data['User']['password']);
        }
    }

    public function delete($id = null) {
        if (!$this->request->is('post')) {
            throw new MethodNotAllowedException();
        }
        $this->User->id = $id;
        if (!$this->User->exists()) {
            throw new NotFoundException(__('Invalid user'));
        }
        if ($this->User->delete()) {
            $this->Session->setFlash(__('User deleted'));
            $this->redirect(array('action'=>'index'));
        }
        $this->Session->setFlash(__('User was not deleted'));
        $this->redirect(array('action' => 'index'));
    }
}
?>

为什么会发生？

Answer 1

确保在您的 AppController 中实际调用了 Auth 组件。如果您没有 AppController，请创建 AppController.php在您的 Controllers 目录中使用以下代码:

<?php
  class AppController extends Controller {
  }
?>

Auth 组件在 AppController 的公共(public)变量中调用，因此 Controller 看起来像这样:

<?php
  class AppController extends Controller {
    public $components = array('Auth');
  }
?>

Auth 现在可在您的整个应用程序中使用。您也可以调用 AuthComponent在您的 UsersController 中，但这将使其仅可用于该特定 Controller 。您可能希望在整个应用程序中使用身份验证。