在yii2中创建一个嵌套对象以获取Json响应作为输出

如何解决在yii2中创建一个嵌套对象以获取Json响应作为输出

我从下面的现有代码中得到一个Json响应

[
    {
        
        "FIRST_NAME": "","LAST_NAME": "","Detail": {
            "COUNTRY": ""
        },]

但是我需要按以下方式打印Json

{
    
    "FIRST_NAME": "","Detail" : [{
        "COUNTRY" : ""
        
    },...]
}

这是我的模型视图代码。.我在这里缺少什么？我被困在这里！我打算做的是用我想要的具有空值的结构创建一个for循环。然后，我要将db值传递到字段中。

private function result($a){
         try{
            
            $ex = Applications::find()
                    ->joinWith(["p p"=>function($p){
                        $p->select(["p.*","t.TITLE_C"])
                                ->joinWith(["title t"])
                                ->joinWith(['country c'])
                                ->orderBy('p.M');
                    }])
                    ->all();
                      
           
            $ex = self::output($ex);
            
            
    
           
            
           return $ex; 
            
            
            return ['status' => 200,'message' => "OK",'count' => 0,'results' => json_encode($results)];
            
        }catch(Exception $ex){
            return ['status' => 400,'message' => $ex->getMessage(),'results' => []]; 
        }
    }





 private function output($ex){
        
        $ex = \yii\helpers\ArrayHelper::toArray($ex,[
                    'temp\models\App' => [
                    
                    
                   
                    "FIRST_NAME" => function($subModel){
                        return "";
},"LAST_NAME" => function($subModel){
                        return "";
},"detail" => function($subModel){
                     
                   if($subModel->p){
                            return self::format($subModel->p);
                        }else{
                            return "";
                        }
                       
                     }
                   
                    
                    
                ]]);
                
        return $ex;
    }



private function format($detail){
    
    $detail = \yii\helpers\ArrayHelper::toArray($detail,[ 
                'temp\models\App1' => [
                
                "COUNTRY"
    
            ]]);
            
    return $detail;
    
}