laravel 5.4:无法在__construct方法中访问Auth :: user()

问题描述：

在以前的Laravel版本中，在我用来执行以下操作的所有方法中，我需要访问登录用户的控制器:

In previous versions of Laravel, in the controllers which I needed to access logged user in all the methods I used to do something like this:

class DashboardController extends Controller
{
    private $user ;
    function __construct(Request $request)
    {
        $this->middleware('auth');
        $this->user = \Auth::user();
    }

    function func_1(){
      $objects = Objects::where('user_id' , $this->user->id )->get();
    }
    function func_2(){
      $objects = Objects::where('user_id' , $this->user->id )->get();
    }
    function func_3(){
      $objects = Objects::where('user_id' , $this->user->id )->get();
    }

主要是因为我不喜欢默认语法\Auth::user()，但是升级到5.4后，它不再起作用，我从$this->user

Mostly because I don't like the default syntax \Auth::user() but after upgrading to 5.4 this doesn't work anymore and I get null from $this->user

尽管如此，它在其他方法中也能正常工作.基本上\Auth::user()在__construct方法中返回null，但在其他函数中工作正常.

It works fine in other methods though. Basically \Auth::user() return null in the __construct method but works fine in the other functions.

答

作为 doc 说:

在以前的Laravel版本中，您可以访问会话变量或控制器的构造函数中经过身份验证的用户.这是绝不打算成为框架的显式功能.在Laravel 5.3，因为中间件尚未运行，所以您无法在控制器的构造函数中访问会话或经过身份验证的用户.

In previous versions of Laravel, you could access session variables or the authenticated user in your controller's constructor. This was never intended to be an explicit feature of the framework. In Laravel 5.3, you can't access the session or authenticated user in your controller's constructor because the middleware has not run yet.

所以尝试一下:

public function __construct()
{
    $this->middleware('auth');
    $this->middleware(function ($request, $next) {
        $this->user = Auth::user();

        return $next($request);
    });
}

laravel 5.4:无法在__construct方法中访问Auth :: user()

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