protected function addCriteriaToPositionQuery($query)
    {
        $contents = ContentFolderQuery::create()
            ->filterByFolderId($this->getDefaultFolderId())
            ->filterByDefaultFolder(true)
            ->select('content_id')
            ->find();

        // Filtrer la requete sur ces produits
        if ($contents != null) {
            $query->filterById($contents, Criteria::IN);
        }
    }