public function actionSimpan()
 {
     $model = new Kategori();
     if ($model->load(Yii::$app->request->post())) {
         $nw = Yii::$app->esmcode->kdKategori();
         $model->KD_KATEGORI = $nw;
         $model->CREATED_BY = Yii::$app->user->identity->username;
         $model->CREATED_AT = date('Y-m-d H:i:s');
         $model->save();
         //                    print_r($model);
         //                    die();
         return $this->redirect(['index']);
     } else {
         return ActiveForm::validate($model);
     }
 }