更新filter

server/backend/controllers/SurveyNewController.php

@@ -157,8 +157,7 @@ class SurveyNewController extends Controller
 			$model->save();
 			return $this->redirect(['index']);
 		}
-		
-		$model->filter = json_decode($model->filter,true);
+
 		return $this->render('update', [
 			'model' => $model,
 			'type'=>$typeDesc,