public function actionListByTag()
{
$tagName = $this->getQuery('tagName');
$orderBy = $this->getQuery('orderBy', 'createdAt');
$accountId = $this->getAccountId();
$result = ['items' => [], 'memberCount' => 0];
$result['items'] = HelpDesk::getByAccountAndTags($tagName, $accountId, $orderBy);
$result['memberCount'] = Member::getMemberCountByTags($tagName, $accountId);
return $result;
}