/**
* 存储小文件文件到集群（2M以内的文件）
*
* @param string $fileBytes
* @param string $fileName
* @return string
*/
public function uploadFile($fileBytes, $fileName)
{
$fileBytes = base64_decode($fileBytes);
$rst = $this->_model->storeBytesToGridFS($fileBytes, $fileName, array('collection_id' => $this->_collection_id, 'project_id' => $this->_project_id));
return $this->result($rst);
}
