class PackageManifestGenerator extends Nette\Object
{
    private $db;
    private $postMethod;
    private $tablesGen;

    public function __construct($db, PostMethodProvider $postMethod, PHPExcel $tablesGen)
    {
        $this->db = $db;
        $this->postMethod = $postMethod;
        $this->tablesGen = $tablesGen;
    }

    public function generate($from, $to)
    {
        $data = array();

        $packages = $this->db->table(...)->where($from, $to);
        foreach ($packages as $package) {
            $postMethod = $this->postMethod->get($packageId);
            $row = array(
                ...,
                $package->senderName,
                ...
            );

            $data[] = $row;
        }

        // ...

        $xls = $this->tables->generate($data); // uz si nepamatuju to api
        return new XlsResponse($xls);
    }
}