protected function isEventActive($shift_id)
 {
     if (($model = Shift::findOne($shift_id)) !== null) {
         return $model->team->event->active;
     } else {
         throw new NotFoundHttpException('The requested page does not exist.');
     }
 }
 public function addUser()
 {
     if (!$this->validate()) {
         return false;
     }
     if (Shift::findOne($this->shift_id === null) || User::findOne($this->user_id == null)) {
         throw new NotFoundHttpException('The requested page does not exist.');
     }
     $participant = new Participant();
     $participant->shift_id = $this->shift_id;
     $participant->user_id = $this->user_id;
     return $participant->save();
 }
 /**
  * Finds the Shift model based on its primary key value.
  * If the model is not found, a 404 HTTP exception will be thrown.
  * @param integer $id
  * @return Shift the loaded model
  * @throws NotFoundHttpException if the model cannot be found
  */
 protected function findModel($id)
 {
     if (($model = Shift::findOne($id)) !== null) {
         return $model;
     } else {
         throw new NotFoundHttpException('The requested page does not exist.');
     }
 }