class Logs extends Model
{
    protected $table = 'logs';

    protected $fillable = ['role_type', 'role_user_id'];

    protected $casts = [
        'role' => CastToRoleTypeEnum::class,
    ];

    public function roleUser()
    {
        return $this->morphTo(__FUNCTION__, 'role_type', 'role_user_id', 'id');
    }
}

class Admins extends Model
{
    protected $table = 'admins';
}

class Users extends Model
{
    protected $table = 'users';
}

class CastToRoleTypeEnum implements CastsAttributes
{
    public function get($model, $key, $value, $attributes)
    {
        return new RoleTypeEnum($value);
    }

    public function set($model, $key, $value, $attributes)
    {
        return $value->getValue();
    }
}

class RoleTypeEnum
{
    public function __construct($value)
    {
        $this->value = $value;
    }

    public function getValue()
    {
        return $this->value;
    }
}

// In AppServiceProvider.php, define the morph map
// Also remember to define Admin/User model which I will not demonstrate here to save space
Relation::morphMap([
    'admin' => 'App\Models\Admins',
    'user' => 'App\Models\Users',
]);