如果选项 id 在刀片视图的数组列表中，Laravel 将选项设置为选中

Question

我在控制器中进行了查询并将其发送到我的刀片：public function editContractorAssociation(DeveloperContractorAssociation $developer_contractor_association, Request $request)    {        $id = $request->id;        $developer_contractor_association = DeveloperContractorAssociation::whereHas('defect_types', function ($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]);    }当我打电话给{{ $developer_contractor_association->defect_types }}我的刀片时，我得到了这个：[    {        "id":2,        "title":"Wiring",        "details":"Fix wiring",        "created_by":"22",        "created_at":"2019-09-04 11:39:48",        "updated_at":"2019-09-04 11:39:48",        "deleted_at":null,        "is_custom":1,        "developer_id":1,        "pivot":{"dca_id":87,"defect_type_id":2}},        {"id":3,"title":"Plumbing",            "details": "Fix Pipe",            "created_by":"22",            "created_at":"2019-09-04 11:40:07",            "updated_at":"2019-09-04 11:40:07",            "deleted_at":null,            "is_custom":1,            "developer_id":1,        "pivot":{"dca_id":87,"defect_type_id":3}    }]现在我有一个选择字段，列出了所有存在的缺陷类型：<select class="selectpicker {{ $errors->has('defect-type-id') ? 'is-invalid' : '' }}" name="defect-type-id[]" id="defect-type-id" multiple data-style="selectpicker-style" data-width="100%" title="Defect Types">    @foreach(App\DefectType::select('id','title')->get() as $defect_type)        <option value="{{$defect_type->id}}">{{$defect_type->title}}</option>    @endforeach</select>

Answer 1

假设你的defect_types关系返回一个 Laravel Collection，你可以使用几个 Collection 方法：

@foreach(App\DefectType::select('id','title')->get() as $defect_type)    

    <option value="{{$defect_type->id}}"

        @if($developer_contractor_association->defect_types->pluck('id')->contains($defect_type->id))

            selected

        @endif

    >

        {{$defect_type->title}}

    </option>

@endforeach

pluck('id')返回一个 Collection ，defect_type id然后您可以检查 all 的当前迭代defect_type是否在该 Collection 中contains($defect_type->id)。

您可以使用containsstrict()代替，contains()因为它会进行严格的比较。