code: public function actionIndex()
      {
          $searchModel = new MahasiswaSearch();
          $dataProvider = $searchModel->search(Yii::$app->request->queryParams);
          
          $field = [
              'fileImport' => 'File Import',
          ];
          $modelImport = DynamicModel::validateData($field, [
              [['fileImport'], 'required'],
              [['fileImport'], 'file', 'extensions'=>'xls,xlsx','maxSize'=>1024*1024],
          ]);
          
          return $this->render('index', [
              'searchModel' => $searchModel,
              'dataProvider' => $dataProvider,
              'modelImport' => $modelImport,
          ]);
      }
docs: Lists all Mahasiswa models.
  @return mixed