BookStack\Role::getRole PHP Метод

    public static function getRole($roleName)
    {
        return static::where('name', '=', $roleName)->first();
    }

 protected function getViewer()
 {
     $role = \BookStack\Role::getRole('viewer');
     $viewer = $this->getNewBlankUser();
     $viewer->attachRole($role);
     return $viewer;
 }