public function findParentRelatedEntries($field_id, $entry_id)
    {
        // Get all the `handles` that have been referenced from the
        // child association.
        $handles = Symphony::Database()->fetchCol('handle', sprintf("
            SELECT `handle`
            FROM `tbl_entries_data_%d`
            WHERE `entry_id` = %d
        ", $this->get('id'), $entry_id));

        // Now find the associated entry ids for those `handles` in
        // the parent section.
        $ids = Symphony::Database()->fetchCol('entry_id', sprintf("
            SELECT `entry_id`
            FROM `tbl_entries_data_%d`
            WHERE `handle` IN ('%s')
        ", $field_id, implode("','", $handles)));

        return $ids;
    }