private function loadWikiListFromDB($userId)
{
$db = $this->getDB(false);
$res = $db->select('wall_notification', ['distinct wiki_id'], ['user_id' => $userId], __METHOD__);
$ids = [];
foreach ($res as $row) {
/** @var Object $row */
$ids[] = $row->wiki_id;
}
WikiFactory::prefetchWikisById($ids, WikiFactory::PREFETCH_WIKI_METADATA);
$output = [];
foreach ($ids as $id) {
$output[$id] = WikiFactory::getWikiByID($id)->city_title;
}
return $output;
}
