public function getTotalAttendCountByActivityId($id)
 {
     return ParticipantHasActivity::find()->where(['Activity_id' => $id, 'attendance' => 1])->count();
 }
 /**
  * Lists all ParticipantHasActivity models.
  * @return mixed
  */
 public function actionIndex()
 {
     $dataProvider = new ActiveDataProvider(['query' => ParticipantHasActivity::find()]);
     return $this->render('index', ['dataProvider' => $dataProvider]);
 }