如果选项id在刀片式服务器视图的阵列列表中，则Laravel将选项设置为选定

Question

我在我的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]);
    }

当我在我的刀片中调用{{ $developer_contractor_association->defect_types }}时，我得到这样的结果：

[
    {
        "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}
    }
]

现在我有了一个select字段，它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>

当填充select字段的选项时，如何检查id是否在defect_type_id JSON中，并将选项设置为selected。如下所示：

<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)
        {{if $defect_type->id in $defect_type_list}}
            <option value="{{$defect_type->id}}">{{$defect_type->title}} selected</option>
        {{else}}
        <option value="{{$defect_type->id}}">{{$defect_type->title}}</option>
    @endforeach
</select>

Answer 1

假设您的defect_types关系返回一个Laravel集合，您可以使用几个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defect_type id集合，然后您可以使用contains($defect_type->id)检查所有defect_type的当前迭代是否在该集合中。

您可以使用containsstrict()而不是contains()，因为这会进行严格的比较。