Why does custom guard get logged out on page reload/redirect?

Question

I created a new guard for logging in custom type of users. I can login users with Auth::attempt('webguest'), but login does not persist over page reloads. It works only when I use web-guard. See for example my two test routes:

Route::get('test1', function () {
    \Auth::guard('webguest')->attempt([ 
        'id' => 5,
        'password' => 2222
    ]);

    // here dump(\Auth::guard('webguest')->check()) shows true

    return \Redirect::to('/test2');
});

Route::get('test2', function () {
    return \Auth::guard('webguest')->check() ? "guest account logged in" : "guest not logged in";
   
   // dumps not logged in

});

My custom guard:

config/auth.php

'guards' => [

    'web' => [
        'driver' => 'session',
        'provider' => 'users',
    ],

    'webguest' => [
        'driver' => 'session',
        'provider' => 'guests'
    ],

],

'providers' => [
    'users' => [
        'driver' => 'eloquent',
        'model' => App\Models\User::class,
    ],

    'guests' => [
        'driver' => 'eloquent',
        'model' => App\Models\Guest::class
    ],
]

Both Guest and User models extend Illuminate\Foundation\Auth\User as Authenticatable.

How can I make login with the custom guard persist like with web guard?

Answer 1

I've found the root cause. In my Guest model the "username" used for login is the id, and there was an overriden method in the model:

 public function getAuthIdentifier() {
            return $this->user->getKey();
 }

I removed it and added the following instead:

 public function getAuthIdentifierName()
    {
        return 'id';
    }

Now the custom guard works like a charm.