yii\mongodb\ActiveQuery::buildCursor PHP Метод

    public function buildCursor($db = null)
    {
        if ($this->primaryModel !== null) {
            // lazy loading
            if ($this->via instanceof self) {
                // via pivot collection
                $viaModels = $this->via->findJunctionRows([$this->primaryModel]);
                $this->filterByModels($viaModels);
            } elseif (is_array($this->via)) {
                // via relation
                /* @var $viaQuery ActiveQuery */
                list($viaName, $viaQuery) = $this->via;
                if ($viaQuery->multiple) {
                    $viaModels = $viaQuery->all();
                    $this->primaryModel->populateRelation($viaName, $viaModels);
                } else {
                    $model = $viaQuery->one();
                    $this->primaryModel->populateRelation($viaName, $model);
                    $viaModels = $model === null ? [] : [$model];
                }
                $this->filterByModels($viaModels);
            } else {
                $this->filterByModels([$this->primaryModel]);
            }
        }
        return parent::buildCursor($db);
    }

 public function buildCursor($db = null)
 {
     return parent::buildCursor($db);
 }