private function actionIsAvailable($kurs, $action)
 {
     /* @var $kursRecord KursExtended */
     $kursRecord = KursExtended::find()->where(['kurs.id' => $kurs])->one();
     if (!$kursRecord || $kursRecord->getAvailableAction()[0] !== $action) {
         return false;
     }
     return true;
 }