Phalcon\Db\Adapter\MongoDB\GridFS\CollectionWrapper::ensureFilesIndex PHP Method

    private function ensureFilesIndex()
    {
        foreach ($this->filesCollection->listIndexes() as $index) {
            if ($index->getKey() === ['filename' => 1, 'uploadDate' => 1]) {
                return;
            }
        }
        $this->filesCollection->createIndex(['filename' => 1, 'uploadDate' => 1]);
    }