AttachedObject::getAttachedObjectById

private function getAttachedObjectById($id)
{
	$attachedObject = DiskAttachedObject::getById($id, array('OBJECT'));
	if(!$attachedObject || !$attachedObject->getFile())
	{
		throw new RestException("Could not find entity with id '{$id}'.", RestException::ERROR_NOT_FOUND);
	}

	return $attachedObject;
}