public static function get_user_logged_in_admin()
 {
     if (isset($_SESSION['user'])) {
         $user_id = $_SESSION['user'];
         $user = User::findOneUser($user_id);
         if ($user->getAdmin()) {
             return true;
         } else {
             return false;
         }
     }
     return null;
 }
 public static function updateUser($id)
 {
     $user = User::findOneUser($id);
     if ($user->getAdmin() == TRUE) {
         Redirect::to('/users', array('message' => 'Admin rights cannot be revoked.'));
     } else {
         $user->makeAdmin();
         $user->updateUser($id);
         Redirect::to('/users', array('message' => 'Chosen user has been promoted to an admin status.'));
     }
 }