Lumen: $user is null inside Policy - php

Question

I am trying to validate if a user exists inside a Policy in Lumen.
This is my Controller function:
public function create(Request $request)
{
$rules = array(
'content' => 'required|string',
);
$user = $request->user();
$this->validate($request, $rules);
$this->authorize('create', Card::class);
This is the Policy:
public function create(User $user)
{
// As long as the user is real, allowed
return $user->id != null;
}
The $user inside the create Policy seems to be null. This is the error:
HttpException in Handler.php line 90:
This action is unauthorized.
in Handler.php line 90
at Handler->render(object(Request), object(AuthorizationException)) in Handler.php line 48
at Handler->render(object(Request), object(AuthorizationException)) in Pipeline.php line 78
at Pipeline->handleException(object(Request), object(AuthorizationException)) in Pipeline.php line 54
at Pipeline->Laravel\Lumen\Routing\{closure}(object(Request)) in Authenticate.php line 42
at Authenticate->handle(object(Request), object(Closure), 'api') in Pipeline.php line 148
at Pipeline->Illuminate\Pipeline\{closure}(object(Request))
at call_user_func(object(Closure), object(Request)) in Pipeline.php line 32
at Pipeline->Laravel\Lumen\Routing\{closure}(object(Request)) in Pipeline.php line 102
at Pipeline->then(object(Closure)) in RoutesRequests.php line 780
at Application->sendThroughPipeline(array('App\\Http\\Middleware\\Authenticate:api'), object(Closure)) in RoutesRequests.php line 626
at Application->handleFoundRoute(array(true, array('uses' => 'App\\Http\\Controllers\\CardController#create', 'middleware' => array('auth:api')), array())) in RoutesRequests.php line 528
at Application->Laravel\Lumen\Concerns\{closure}(object(Request))
at call_user_func(object(Closure), object(Request)) in Pipeline.php line 52
at Pipeline->Laravel\Lumen\Routing\{closure}(object(Request)) in ExampleMiddleware.php line 18
at ExampleMiddleware->handle(object(Request), object(Closure)) in Pipeline.php line 148
at Pipeline->Illuminate\Pipeline\{closure}(object(Request))
at call_user_func(object(Closure), object(Request)) in Pipeline.php line 32
at Pipeline->Laravel\Lumen\Routing\{closure}(object(Request)) in Pipeline.php line 102
at Pipeline->then(object(Closure)) in RoutesRequests.php line 780
at Application->sendThroughPipeline(array('App\\Http\\Middleware\\ExampleMiddleware'), object(Closure)) in RoutesRequests.php line 534
at Application->dispatch(object(Request)) in RoutesRequests.php line 475
at Application->run(object(Request)) in index.php line 29

Answer 1

I meet the same problem.
But the issue is nothing about the policy class.
This is resolved by using fully qualified class name in AuthServiceProvider file,
change:
Gate::policy(Post::class, PostPolicy::class);
to:
Gate::policy(\App\Post::class, \App\Policies\PostPolicy::class);
hope this help.