刀片视图中的 Laravel 查询

Question

你如何翻译这个查询 blade.php$developer_contractor_association = DeveloperContractorAssociation::whereHas('defect_types', function ($query) use($id) {            $query->where('developer_contractor_associations.id', $id);        })->orwhereHas('contractor', function ($query) use($id) {            $query->where('developer_contractor_associations.id', $id);        })->first();    return view('dev-admin.contractors.associations.edit', ['developer_contractor_association' => $developer_contractor_association]);我尝试使用上面的方法，但是当涉及到刀片时它不起作用@foreach($developer_contractor_association as $dca_details)    <h2> {{ $dca_details->user->name }} </h2>    <p><i class="fas fa-map-marker-alt"></i>{{ $dca_details->contractor->address }}</p>    <p><i class="fas fa-envelope"></i>{{ $dca_details->user->email }}</p>    <p><i class="fas fa-phone"></i></i>{{ $dca_details->contractor->contact_no }}</p>@endforeach它说：试图获取非对象的属性“名称”更新 ：我在查询时犯了一些错误，我不需要foreach，这修复了我的代码。谢谢大家帮忙<div id="contractor-details" class="col-sm-12 col-md-12">    <h2> {{ $developer_contractor_association->contractor->user->name }} </h2>    <p><i class="fas fa-map-marker-alt"></i>{{ $developer_contractor_association->contractor->address }}</p>    <p><i class="fas fa-envelope"></i>{{ $developer_contractor_association->contractor->user->email }}</p>    <p><i class="fas fa-phone"></i></i>{{ $developer_contractor_association->contractor->contact_no }}</p></div>

Answer 1

您应该使用get()而不是first()，然后使用dd($dca_details)变量 inforeach()查看 $dca_details 是否有用户，如果它有使用 dd($dca_details->user->name)

处理此错误的最佳方法是使用：

{{ $dca_details->user->name ?? '-' }}

Answer 2

那是因为一个 developer_contractor_association 没有用户。你必须使用

@foreach($developer_contractor_association as $dca_details)

    <h2> {{ $dca_details->user->name ?? 'User absent' }} </h2>

    <p><i class="fas fa-map-marker-alt"></i>{{ $dca_details->contractor->address ?? ''}}</p>

    <p><i class="fas fa-envelope"></i>{{ $dca_details->user->email ?? ''}}</p>

    <p><i class="fas fa-phone"></i>{{ $dca_details->contractor->contact_no ?? ''}}</p>

@endforeach

或者你可以使用

@foreach($developer_contractor_association as $dca_details)

    @if(empty($dca_details->user) || empty($dca_details->contractor))

        @continue

    @endif

    <h2> {{ $dca_details->user->name }} </h2>

    <p><i class="fas fa-map-marker-alt"></i>{{ $dca_details->contractor->address }}</p>

    <p><i class="fas fa-envelope"></i>{{ $dca_details->user->email }}</p>

    <p><i class="fas fa-phone"></i>{{ $dca_details->contractor->contact_no }}</p>

@endforeach

或在控制器使用中

$developer_contractor_association = DeveloperContractorAssociation::whereHas('defect_types', function ($query) use($id) {

        $query->where('developer_contractor_associations.id', $id);

    })->orwhereHas('contractor', function ($query) use($id) {

        $query->where('developer_contractor_associations.id', $id);

    })->has('user')

   ->has('contractor')

   ->get();

return view('dev-admin.contractors.associations.edit', ['developer_contractor_association' => $developer_contractor_association]);