Question

我正在使用laravel 5.7，但无法在__construct（）中获得当前用户ID。

我还尝试了Auth：id（），但它也无法正常工作。

如何在构造函数中获取当前用户ID？

use Illuminate\Support\Facades\Auth;

class TestController extends Controller
{

    public $id;

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

当前输出为空。

Answer 1

返回后，您将不会转到下一条不会打印的语句。

如果要在视图中使用此视图，则无需通过视图，您可以像这样简单地访问已记录的用户ID

{{Auth->user->id}}

如果您想在控制器中使用它，请确保您已登录。

有时会话已过期，那么您将不会获得用户ID

use Illuminate\Support\Facades\Auth;

class TestController extends Controller
{

    public $id;

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

    }
  }

Answer 2

You can only access the session in the closure. Just refactor your code to this:

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

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

You can now use the value $this->id in your controller methods.

In the example in your question, after you've set the value $this->id, you continue with the request. Since you try to access $this->id outside of the scope of the closure, it still is null in the datadump.

Answer 3

最简单的解决方案是创建一个中间件，然后在构造函数中调用它。

php artisan make:middleware FoobarMiddleware

我建议在Kernel.php中放置一个别名

protected $routeMiddleware = [
...
'foobar' => \App\Http\Middleware\FoobarMiddleware::class, 
]

构造函数：

public function __construct()
{
    $this->middleware('auth');
    $this->middleware('foobar');
}

我建议更改创建所有内容的重点

如何在laravel的构造函数中获取当前用户ID？

3 个答案: