public function actionApplySuccess()
{
$activityUserId = Yii::$app->request->get('id');
$activityUser = ActivityUsers::findOne(['id' => $activityUserId]);
$maxCount = ActivityUsers::getMaxSignUpOrder($activityUser['activity_id']);
$activityName = Activity::getOneActivityNameById($activityUser['activity_id']);
$data = ['maxCount' => $maxCount, 'activityName' => $activityName];
return $this->redirect(['/activity/apply-success', 'data' => $data]);
}