public function findRelatedEntries($entry_id, $parent_field_id)
    {
        try {
            $ids = Symphony::Database()->fetchCol('entry_id', sprintf("
                SELECT `entry_id`
                FROM `tbl_entries_data_%d`
                WHERE `relation_id` = %d
                AND `entry_id` IS NOT NULL
            ", $this->get('id'), $entry_id));
        } catch (Exception $e) {
            return array();
        }

        return $ids;
    }