public function searchIds(array $cond, array $options = array()): SearchResult
    {
        $params = $options + array('cond' => $cond);

        $params['ids_only'] = true;

        $result = $this->getEntityDao()->search($params);

        if (!$result instanceof SearchResult) {
            throw new FindException('Data Access Object did not return a search result');
        }

        return $result;
    }