public function findByParent($parentId, $siteId)
    {
        $qa = $this->createAggregationQueryBuilderWithSiteId($siteId);
        $qa->match(array('parentId' => $parentId));

        return $this->hydrateAggregateQuery($qa);
    }
public function findByParent($parentId, $siteId)
    {
        $qa = $this->createAggregationQueryBuilderWithSiteId($siteId);
        $qa->match(array('parentId' => $parentId));

        return $this->hydrateAggregateQuery($qa);
    }
@param string $parentId
@param string $siteId

@throws \Exception

@return mixed