public function adminCsvAction() { 

    $repository = $this->getDoctrine()->getRepository('AcmeTestBundle:Test'); 
    $query = $repository->createQueryBuilder('s'); 
    $query->orderBy('s.id', 'DESC'); 

    $data = $query->getQuery()->getResult(); $filename = "export_".date("Y_m_d_His").".csv"; 
    
    $response = $this->render('AcmeTestBundle:Default:adminCsv.html.twig', array('data' => $data)); 

    $response->setStatusCode(200);
    $response->headers->set('Content-Type', 'text/csv');
    $response->headers->set('Content-Description', 'Submissions Export');
    $response->headers->set('Content-Disposition', 'attachment; filename='.$filename);
    $response->headers->set('Content-Transfer-Encoding', 'binary');
    $response->headers->set('Pragma', 'no-cache');
    $response->headers->set('Expires', '0');

    $response->prepare();
    $response->sendHeaders();
    $response->sendContent();
    
    return $response; 
}