集合中的Laravel eloquent ignore字段（如果为空）

因此，我与多个表有关系：

    $business = Business::where('id', $id)
                    ->with('addresses')
                    ->with('location')
                    ->with('gallery')
                    ->get();

这带来了类似于：

[{"id":100,"name":"Live","type":"4","email":"p.woj6@gmail.com","logo":null,"twitter_business":null,"facebook_business":null,"instagram_business":"Woas","image":null,"gallery_id":null,"user_id":3,"api_key":null,"created_at":"2017-06-22 15:13:47","updated_at":"2017-06-22 15:13:47","addresses":[{"id":6,"firstline_address":"96","secondline_address":"Street","town":"","city":"","postcode":"","telephone":"","created_at":"2017-06-22 15:13:47","updated_at":"2017-06-22 15:13:47","pivot":{"business_id":100,"address_id":6}}],"location":{"id":95,"business_id":100,"longitude":-2.054067,"latitude":53.486755,"slug":"Live & Now","created_at":"2017-06-22 15:13:47","updated_at":"2017-06-22 15:13:47"},"gallery":null}]

Business::where('id', $id)
                ->with('addresses')
                ->with('location')
                ->with('gallery')
                ->get()
                ->map(function($business){
                   return $business->image = !$business->image ? $business->image = 'N/A' : $business->image 
                });

但是，我得到一个错误，即集合中不存在空的图像。如果$business->image为空，则忽略它

我试过：

    @if($business->image == "null")
        <img class="images" id="image" alt="no image" src="" />
    @else
        <img class="images" id="image" src="{{ asset($business->image) }}" />
    @endif

@if（$business->image==“null”）
@否则
图像）}}}”/>
@恩迪夫

但是没有成功，我正在寻找一种有效的方法，因为有时有多个字段是空的

        @if($business->image == "null")
            <img class="images" id="image" alt="no image" src="" />
        @else
            <img class="images" id="image" src="{{ asset($business->image) }}" />
        @endif
<div id="right" class="map">
    <div id="map"></div>

        <script type="text/javascript" src="https://maps.google.com/maps/api/js?v=3&key=AIzaSyAirYgs4Xnt9QabG9v56jsIcCNfNZazq50&language=en"></script>      
<!-- Displaying markers for business -->
                            @foreach ($business->location as $marker)
                                <script>
                            var map = new google.maps.Map(document.getElementById('map'), {
                            zoom: 19,
                            center: {lat: {{$marker->latitude}}, lng: {{$marker->longitude}}}
                             });

                                var marker = new google.maps.Marker({
                                position: {lat: {{$marker->latitude}}, lng: {{$marker->longitude}}},
                                map: map,
                                title: '{{$business->name}}'
  });

                        </script>
                        @endforeach

@if（$business->image==“null”）
@否则
图像）}}}”/>
@恩迪夫
@foreach（$business->location as$marker）
var map=new google.maps.map（document.getElementById（'map'）{
缩放：19，
中心：{lat:{{$marker->latitude}，lng:{{{$marker->longitude}}
});
var marker=new google.maps.marker({
位置：{lat:{{$marker->latitude}，lng:{{{$marker->longitude}}，
地图：地图，
标题：“{{$business->name}”
});
@endforeach

此处：

Business::where('id', $id)
                ->with('addresses')
                ->with('location')
                ->with('gallery')
                ->get()
                ->reject(function($business){
                   return !$business->image;
                });

这将拒绝具有空图像的业务，如果您仍希望浏览图像，您可以这样做，但填充字段，您可以尝试以下操作：

[{"id":100,"name":"Live","type":"4","email":"p.woj6@gmail.com","logo":null,"twitter_business":null,"facebook_business":null,"instagram_business":"Woas","image":null,"gallery_id":null,"user_id":3,"api_key":null,"created_at":"2017-06-22 15:13:47","updated_at":"2017-06-22 15:13:47","addresses":[{"id":6,"firstline_address":"96","secondline_address":"Street","town":"","city":"","postcode":"","telephone":"","created_at":"2017-06-22 15:13:47","updated_at":"2017-06-22 15:13:47","pivot":{"business_id":100,"address_id":6}}],"location":{"id":95,"business_id":100,"longitude":-2.054067,"latitude":53.486755,"slug":"Live & Now","created_at":"2017-06-22 15:13:47","updated_at":"2017-06-22 15:13:47"},"gallery":null}]

Business::where('id', $id)
                ->with('addresses')
                ->with('location')
                ->with('gallery')
                ->get()
                ->map(function($business){
                   return $business->image = !$business->image ? $business->image = 'N/A' : $business->image 
                });

或者，您可以检查它在循环中是否为空。这里有很多选择^^

还使用：

你可以这样做：

这将确保始终存在邮政编码，无论它是实际的邮政编码还是0

public function setPostcodeAttribute($value){
   $this->postcode = !$value ? 0 : $value;
}

---

是的，但不仅图像是空的，还有其他位也是空的，所以我不想去拒绝->图像，拒绝->地址->邮政编码等我想拒绝所有为空的内容，在这种情况下，你最好使用雄辩的getter和setter来确保每个字段都有可预测的数据，或者在数据库中默认它。从来没有听说过getter和setter，你能提供一个基于我案例的示例吗？奇怪的是它说$business->addresses在当前集合中不存在，但它确实存在，为什么？让我们来看看。