Question

我的桌子上有多个与vehicle_id相关的图片，像这样

image table
id          fileName        vehicle_id
1            1.jpg               1
2            2.jpg               1
3            3.jpg               1
4            4.jpg               1
5            28.png              2
5            28.png              2
6            29.png              2
7            30.png              3
8            31.png              3
9           56.png               3

使用VehicleController中的eager loader，车辆表与图像表和数据抓取之间有很多关系

$vehicles = Vehicle::with('image')->get();
        return view('vechicles.index')->withVehicles($vehicles);

现在这些图像显示在Vehicles / index.blade.php文件中

@foreach($vehicle->images as $image)

     <tr>
                    <td><a href="{{route('vechicles.show',$vehicle->id)}}"><img src="/images/{{ $image->resized_name }}"></a></td>

                </tr>

    @endforeach

我的问题现在发生了，用这种方式，我可以在表中显示与正确的vehicle_id相关的所有图像，但是，我只需要显示一张图像（与vehicle_id匹配）就可以像缩略图一样。上面的线。那我该如何配置呢？

更新后的控制器

 public function index()
    {
        $vehicles = Vehicle::with('images')->get();
        return view('vechicles.index')->withVehicles($vehicles);
    }

更新了完整刀片

@extends('layouts.app')

@section('content')
<div class="container"> 
    <div class="row"> 
        <div class="col-md-10 col-md-offset-1">
@if($vehicles)

@foreach($vehicles as $vehicle)
{{$vehicle->district}}
{{$vehicle->town}}
{{$vehicle->brand}}
{{$vehicle->model}}
<hr>
@foreach($vehicle->images as $image)

     <tr>
                    <td><a href="{{route('vechicles.show',$vehicle->id)}}"><img src="/images/{{ $image->resized_name }}"></a></td>

                </tr>

    @endforeach

@endforeach
@endif

</div>

</div>
</div>
@endsection

Answer 1

您正在循环浏览所有图像。您只需使用以下代码即可检索图像：

 $vehicle->images()->first()->resized_name

因此您显示图片的代码将是：

@extends('layouts.app')

@section('content')
 <div class="container"> 
  <div class="row"> 
    <div class="col-md-10 col-md-offset-1">
     @if($vehicles)

     @foreach($vehicles as $vehicle)
      {{$vehicle->district}}
      {{$vehicle->town}}
      {{$vehicle->brand}}
      {{$vehicle->model}}
      <hr>
       <tr>
        <td>
         <a href="{{route('vechicles.show',$vehicle->id)}}"><img 
          src="/images/{{ $vehicle->images()->first()->resized_name 
         }}"></a>
        </td>
       </tr>

    @endforeach
    @endif

 </div>

 </div>
 </div>
 @endsection

Answer 2

您可以将limit与with函数一起使用，例如：

Vehicle::with(['image' => function($query) {
        return $query->limit(1);
    }])->get();
return view('vechicles.index')->withVehicles($vehicles);

并编写代码以将图像显示为：

<tr>
    <td><a href = "{{route('vechicles.show',$vehicle->id)}}"><img src = "/images/{{ $vehicle->images[0]->resized_name }}"></a></td>
</tr>

Answer 3

您仅可以拍摄第一张图像。但是请注意，您必须验证该车辆是否有任何图像，否则将引发异常。

@if ($vehicle->images->isNotEmpty())
    <a href="{{route('vechicles.show',$vehicle->id)}}">
        <img src="/images/{{ $vehicle->images->first()->resized_name }}">
    </a>
@endif

Answer 4

您可以使用laravel first()函数。

$vehicles = Vehicle::->where('vehicle_id', 1)->first();

Answer 5

您只需要显示刀片中的第一个阵列图像，如下所示：

 @foreach ($vehicles as $v)
     <img src = "/images/{{ $v->images[0]->resized_name }}"
 @endforeach

 (or) we can also use the laravel first() function to display the first record image from the collection

 @foreach ($vehicles as $v)
     <img src = "/images/{{ $v->images->first()->resized_name }}"
 @endforeach

如何在Laravel 5.6的索引页中仅显示一张图像？

5 个答案: