private function sortObjects(array $objects, $serialize = true)
{
$documents = array();
$serializer = $this->sm->getSerializer();
foreach ($objects as $object) {
$document = $serialize ? $serializer->serialize($object) : $object;
$id = (string) $object->getId();
if (!$id) {
throw new DoctrineSearchException('Entity must have an id to be indexed');
}
$documents[get_class($object)][$id] = $document;
}
return $documents;
}