yii2 editable internal server error

Question

I have Gangguan model, I have id_registrasi (not a PK) in Gangguan model, I want to edit id_registrasi in my gridView using editable, the pop up windows give an error message "Internal Server Error" but when I refresh page (F5), the column has successful changed. and the problem is i cant handle that error. .. this is my controller

if(Yii::$app->request->post('hasEditable')){
        $Id = Yii::$app->request->post('editableKey');
        $model1 = $this->findModel($Id);
        $posted = current($_POST['Gangguan']);
            $model1->id_registrasi = $posted['id_registrasi'];
            $model1->save(false);
          $output =  $model1->id_registrasi;
         $out = Json::encode(['output'=>$output, 'message'=>'']); 
       echo $out;
         return;
}

and this is the column

[
'class' => 'kartik\grid\EditableColumn',
'attribute'=>'id_registrasi',
'hAlign' => 'top',
'vAlign' => 'middle',
'width'=>'100px',
'headerOptions' => ['class' => 'kv-sticky-column'],
'contentOptions' => ['class' => 'kv-sticky-column'],
          'footerOptions' => ['class' => 'kv-sticky-column'],
'pageSummary' => true,
],

Answer 1

Use the following in your controller and it should be ok then.

use yii\helpers\json;