public static function setApplicationDocumentManager(Application $application, $dmName)
{
$service = null === $dmName ? 'doctrine_phpcr.odm.document_manager' : 'doctrine_phpcr.odm.' . $dmName . '_document_manager';
$documentManager = $application->getKernel()->getContainer()->get($service);
$helperSet = $application->getHelperSet();
$helperSet->set(new DocumentManagerHelper(null, $documentManager));
}