private function cacheKey($ident)
    {
        if ($this->objKey === null) {
            $model = $this->factory->get($this->objType);
            $this->setObjKey($model->key());
        }

        $cacheKey = 'object/'.str_replace('/', '.', $this->objType.'.'.$this->objKey.'.'.$ident);

        return $cacheKey;
    }