Symfony 2 CSV Export

symfonyCSV.html.twig

id, field1, field2, field3 
{% for row in data %}
    {{ row.id }},{{ row.field1 }},{{ row.field2 }},{{ row.field3 }}
{% endfor %}

symfonyCSVAction.php

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; 
}

symfonyCSVRoute.yaml

admin_csv: 
pattern: /admin/csv 
defaults: { _controller: AcmeTestBundle:Default:adminCsv }

Only use return $response;
$response->prepare(); is deprecated in 2.4
$response->sendHeaders(); is redundant

Regards