Laravel Auth::user()始终为空

Route::middleware(['auth'])->group(function () {
    Route::get('/profile', function () {
        return view('profile');
    });
});

'driver' => env('SESSION_DRIVER', 'file'),
'files' => storage_path('framework/sessions'),

use Illuminate\Support\Facades\Auth;

if (Auth::attempt(['email' => $email, 'password' => $password])) {
    // 登录成功
    return redirect()->intended('dashboard');
}

<form method="POST" action="/login">
    @csrf
    <!-- 其他字段 -->
</form>

use Illuminate\Foundation\Auth\User as Authenticatable;

class User extends Authenticatable
{
    // 模型字段和方法
}

php artisan cache:clear
php artisan config:clear
php artisan route:clear
php artisan view:clear

namespace App\Http\Controllers\Auth;

use App\Http\Controllers\Controller;
use Illuminate\Foundation\Auth\AuthenticatesUsers;
use Illuminate\Http\Request;

class LoginController extends Controller
{
    use AuthenticatesUsers;

    protected $redirectTo = '/home';

    public function __construct()
    {
        $this->middleware('guest')->except('logout');
    }

    protected function validateLogin(Request $request)
    {
        $request->validate([
            'email' => 'required|email',
            'password' => 'required|min:6',
        ]);
    }

    protected function attemptLogin(Request $request)
    {
        return $this->guard()->attempt(
            $this->credentials($request), $request->filled('remember')
        );
    }
}