public function exportFileMetaAction()
    {
        //wyszukiwanie pliku
        if (null === $files = (new Orm\CmsFileQuery)->whereName()->equals($this->name)
            ->find()) {
            throw new \Mmi\Mvc\MvcNotFoundException('File not found');
        }
        $data = [];
        //iteracja po plikach
        foreach ($files as $file) {
            //spłaszczenie meta-danych
            $file->data = ($file->data && ($file->data instanceof \Mmi\DataObject)) ? json_encode($file->data->toArray()) : null;
            $data[] = $file->toArray();
        }
        //zwrot meta
        return json_encode($data);
    }