获取收集Laravel

Question

我是Laravel框架的新学习者 顾客， 事故， 执照 关系如下：

public  function License()
        {
            return $this->hasOne(license::class,'driver_id');
        }

    public function cars()
        {
            return $this->hasMany(car::class);
        }

我喜欢这样：

public function AdminCustomers()
    {
        $customers = Customer::with('cars')->with('License')->get();
        return view('admin.AdminCustomers',compact('customers'));
    }

现在我想在View.blade页面上显示所有3个模型的数据

<tbody>
                    @foreach($customers as $customer)

                                    <tr>
                                        <td>{{$customer->id}}</td>
                                        <td>{{$customer->name}}</td>
                                        <td>{{$customer->adderss}}</td>
                                        <td>{{$customer->mobileNo}}</td>
                                        <th>{{$customer->License->id}}</th>
                                        <th>{{$customer->License->Exp}}</th>
                                        <td>{{$customer->cars->id}}</td>
                                        <td>{{$customer->cars->color}}</td>
                                        <td>{{$customer->cars->model_no}}</td>
                                        <td>{{$customer->cars->company}}</td>
                                    </tr>
                               
                    @endforeach
                    </tbody>

在控制器中， 错误例外

Property [id] does not exist on this collection instance.

Answer 1

$ customer-＆gt; cars将返回集合，因为该关系是hasmany，因此您需要在视图中循环浏览集合

@foreach($customers as $customer)

    <tr>
        <td>{{$customer->id}}</td>
        <td>{{$customer->name}}</td>
        <td>{{$customer->adderss}}</td>
        <td>{{$customer->mobileNo}}</td>
        <th>{{$customer->License->id}}</th>
        <th>{{$customer->License->Exp}}</th>
            @foreach($customer->cars as $car)
                <td>{{$car->id}}</td>
                <td>{{$car->color}}</td>
                <td>{{$car->model_no}}</td>
                <td>{{$car->company}}</td>
            @endforeach
    </tr>
                               
@endforeach

Answer 2

在DB上的Corrisponding表中检查名称，如果它与“ ID”不同，则将其指定为模型

protected $primaryKey = 'xxx';