public function render($value = null)
{
if ($value === null) {
$value = $this->renderChildren();
}
if ($value === null) {
return null;
}
if (!is_object($value)) {
throw new ViewHelper\Exception('f:format.identifier expects an object, ' . gettype($value) . ' given.', 1337700024);
}
return $this->persistenceManager->getIdentifierByObject($value);
}