/**
  * Finds the Fields model based on its primary key value.
  * If the model is not found, a 404 HTTP exception will be thrown.
  * @param string $id
  * @return Fields the loaded model
  * @throws NotFoundHttpException if the model cannot be found
  */
 protected function findModel($id)
 {
     if (($model = Fields::findOne($id)) !== null) {
         return $model;
     } else {
         throw new NotFoundHttpException('The requested page does not exist.');
     }
 }
 public function actionDeleteField()
 {
     if (Yii::$app->request->isAjax) {
         if (isset($_POST['id'])) {
             $bool = Fields::findOne(['id' => $_POST['id']])->delete();
             if ($bool) {
             }
         }
     }
 }