Question

In CakePHP 2 you could specify which components to load in the controller by providing a $components property.

class AppController extends Controller
{

    public $components = [
        'RequestHandler',
        'Security'
    ];
}

I notice this still works in CakePHP 3 but that most of the book uses a new method in which you load every component separately:

public function initialize()
{
    $this->loadComponent('RequestHandler');
    $this->loadComponent('Security');
}

Is the $components property provided only for backwards compatibility? I want to do it the correct Cake 3 way, especially if the former method will be deprecated at some point in the future.

Are there any differences in functionality between the two methods?

If I try to configure the SecurityComponent like this, it doesn't work and the configuration seems to be completely ignored, even though it's a valid use of the method:

public function initialize()
{
    $this->loadComponent('Security', ['blackHoleCallback', 'blackhole']);
}

Instead, I have to make a separate method call in beforeFilter() to set the configuration and get it to actually work:

public function initialize()
{
    $this->loadComponent('Security');
}

public function beforeFilter(Event $event)
{
    $this->Security->config('blackHoleCallback', 'blackhole');
}

However, the old 'Cake 2' way still works fine:

class AppController extends Controller
{

    public $components = [
        'RequestHandler',
        'Security' => ['blackHoleCallback' => 'blackhole']
    ];
}

Answer 1

$ components属性是否仅提供向后兼容性？我想用正确的Cake 3方式做到这一点，特别是如果以前的方法将在某个时候被弃用。

尚未弃用as you can see here。但是通过方法调用加载它是更好的方法。我想该属性将在4.x中被删除，并且可能在将来的3.x版本中被弃用。

阅读这些内容：

CakePHP 3 - How to load components

1 个答案: