public function getFileSetIDs()
    {
        $app = Application::getFacadeApplication();
        $db = $app->make(Connection::class);
        $rows = $db->fetchAll('select fsID from FileSetFiles where fID = ?', [$this->getFileID()]);
        $ids = array_map('intval', array_map('array_pop', $rows));

        return $ids;
    }