public function getQueueSet()
{
$root = $this->getRootQueue();
if (is_array($root)) {
throw new \Exception('Unexpected configuration of multiple root queues' . print_r($root, true));
$rid = $root[0]->id;
} else {
$rid = $root->id;
}
return QueueSet::model()->findByAttributes(array('initial_queue_id' => $rid));
}