public function exportAction($cf_group_id, Request $request)
    {
        $em = $this->getDoctrine()->getManager();

        $cFGroup = $em->getRepository('ChillCustomFieldsBundle:CustomFieldsGroup')->find($cf_group_id);
        $reports = $em->getRepository('ChillReportBundle:Report')->findByCFGroup($cFGroup);


        $response = $this->render('ChillReportBundle:Report:export.csv.twig', array(
            'reports' => $reports,
            'cf_group' => $cFGroup
        ));

        $response->headers->set('Content-Type', 'text/csv; charset=utf-8');
        $response->headers->set('Content-Disposition', 'attachment; filename="export.csv"');
        return $response;
    }