public function getDefaultSortingDirection($field)
    {
        if (!empty($field) && is_string($field)) {
            switch ($field) {
                case 'sortdate':
                case 'score':
                    $orderBy = 'desc';
                    break;
                case 'title':
                default:
                    $orderBy = 'asc';
                    break;
            }
            return $orderBy;
        } else {
            return 'asc';
        }
    }