Laravel logging System User fails - php

Question

Im trying to log in a system user without sessions or cookies.
The following code in my middelware works unless the user id is from a system user:
$interface_token = $request->header('token');
if ($interface_token !== 'my_secret') {
return response('Unauthorized', 401);
}
$user_id = 1; // Just for testing. Here I want to login a system user.
$success = Auth::onceUsingId($user_id);
if (!$success)
{
throw new Exception('failed!');
}
I want to log in a system user since this specific routes are going to be call from an internal service not from a "real" user.
If I update the table users setting system_user = 0 of user id 1, it works.
If system_user = 1 then it doesn't authenticate.
This system_user column is just a tinyint added to the user's table that shouldn't affect but apparently it does.
The user model is using the SystemUserTrait.
Any ideas?
I'm using Laravel 5.4
Edit
The SystemUserTrait is adding a global scope which does the following:
public function apply(Builder $builder, Model $model)
{
$builder->where('system_user', '=', 0);
}
So that's why it was not working with the user system. But now the question is if is possible to disable this to authenticate the user.
I tried the following without success:
$user = User::withoutGlobalScope(SystemUser::class)->find(1);
$success = Auth::login($user);
The user is fetched but the login fails anyway.
Is there a way to avoid using the global scope for a function?

Answer 1

The solution was to fetch the user with User::withoutGlobalScope and then to use Auth::setUser function to avoid queries which used the scope.
$interface_token = $request->header('token');
if ($interface_token !== 'my_secret') {
return response('Unauthorized', 401);
}
$user = User::withoutGlobalScope(SystemUser::class)->find(1);
Auth::setUser($user);