Dynamic relationship

Assuming there is a User model with a role field (string) and these relation :

// User can be one of these
    public function admin(): HasOne
    {
        return $this->hasOne(Admin::class);
    }

    public function teacher(): HasOne
    {
        return $this->hasOne(Teacher::class);
    }

    public function student(): HasOne
    {
        return $this->hasOne(Student::class);
    }

How can I load the appropriate relation based on the role field? Also, how can I display the data in the view?

1. Do I always have to check the role field?

$user
            ->when($user->role === UserRole::ADMIN, function () use ($user) {
                $user->load('admin');
            })
            ->when($user->role === UserRole::TEACHER, function () use ($user) {
                $user->load('teacher');
            })
            ->when($user->role === UserRole::STUDENT, function () use ($user) {
                $user->load('student');
            });

// view
<p>{{ $user->username }}</p>
<p>{{ $user->name }}</p>
...
@if($user->role === UserRole::ADMIN)
  {{-- specific admin field --}}
@elseif() 
  {{-- another specific role field --}}
@endif

1. Or should I apply polymorphic relationship?
2. Or should I create an additional method?

public function appropriateRole() {
  if ($this->role === UserRole::ADMIN) {
    return $this->admin();
  }
// another check role ...
}