public function canEditProject($projectId, $project = null)
 {
     $ret = $this->isAdmin() ? true : false;
     if (!$ret && $this->isEditor()) {
         // check if the user has the right to edit the project
         $queryBuilder = new Phalcon\Mvc\Model\Query\Builder();
         $queryBuilder->from('UsersProjects');
         $queryBuilder->columns('id');
         $queryBuilder->where('user_id = :userId: AND project_id = :projectId:', array('userId' => $this->id, 'projectId' => $projectId));
         $queryBuilder->inWhere('privilege', ['admin', 'editor']);
         if (count($queryBuilder->getQuery()->execute()) > 0) {
             $ret = true;
         }
     }
     return $ret;
 }