public function actionCourselist($catid = null)
 {
     if (!empty($catid)) {
         //$model = Course::find()->where('cat_id'=> $catid)->all();
         $searchModel = new CourseSearch();
         $searchModel->category_id = $catid;
         $dataProvider = $searchModel->search(Yii::$app->request->queryParams);
         $dataProvider->pagination->pageSize = 0;
     } else {
         $searchModel = new CourseSearch();
         $dataProvider = $searchModel->search(Yii::$app->request->queryParams);
         $dataProvider->pagination->pageSize = 0;
     }
     return $this->render('courselist', ['searchModel' => $searchModel, 'dataProvider' => $dataProvider]);
 }
 /**
  * Lists all Course models.
  * @return mixed
  */
 public function actionIndex()
 {
     $searchModel = new CourseSearch();
     $dataProvider = $searchModel->search(Yii::$app->request->queryParams);
     return $this->render('index', ['searchModel' => $searchModel, 'dataProvider' => $dataProvider]);
 }