多对多关系 - 保存在多个数据库列中并检索

Question

我有许多车与干洗的关系。

模型干洗：

func application(_ app: UIApplication, open url: URL, options: [UIApplicationOpenURLOptionsKey : Any] = [:]) -> Bool {
    // My root view controller is a UINavigationController
    // Cast this to whatever class your root view controller is
    guard let navigationController = self.window?.rootViewController as? UINavigationController else {
        return false
    }

    // Navigate to the view controller that handles the URL within the navigation stack
    navigationController.popToRootViewController(animated: false)

    // Handle the URL
    let vc = navigationController.topViewController as! ViewController
    vc.handleDeepLink(url: url)
    return true
}

并在模型车中：

public function carts()
  {
    return $this->belongsToMany('App\cart');
  }

在视图文件中，我接受复选框值为：drycleaning_id []并输入值为q_drycleaning_id []

 public function drycleanings()
    {
      return $this->belongsToMany('App\drycleaning');
    }

我将值保存到cart_drycleaning数据库表

保存drycleaning_id，由

视图中的复选框拍摄

@foreach($drycleaning as $drycleaning)
    <div class="checkbox" ><label><input type="checkbox" name="drycleaning_id[]" value="{{$drycleaning->id}}">{{$drycleaning->name}}</label></div>
    <input type="text"  name="q_drycleaning_id[]"  placeholder=" {{$drycleaning->name}} Quantity">
 @endforeach

检索我用过的数据

$cart->drycleanings()->attach($request->drycleaning_id); 

请帮我将q_drycleaning_id []的输入值保存到同一个表格中，即cart_drycleaning。并检索它以便查看。

提前致谢。