public function deleteObject($o)
    {
        if (\PHPDaemon\Core\Daemon::$config->logevents->value) {
            \PHPDaemon\Core\Daemon::log(__METHOD__ . '(' . json_encode($o) . ')');
        }

        $this->cache->get('_id.' . ((string)$o['_id']),
            function ($mc) use ($o) {
                if (is_string($m->result)) {
                    $mc->delete($m->result);
                    $mc->delete('_id.' . $o['_id']);
                }
            }
        );
    }