多个类别和每个类别的Laravel验证规则具有多个子类别

Question

我知道如何验证多个类别，如：

'categories' => 'required|array',
'categories.*' => 'required|exists:categories,id'

但我不知道如何验证每个类别的子类别

@foreach($attributes as $attribute)
    @if(count($attribute['properties']) > 0)
    <div class="form-group">
        <label  class="col-md-4 control-label">{{ $attribute['title']}} <span class="text-danger">*</span></label>
        <div class="col-md-6">
            <select class="form-control {{($attribute['select_many'] == 1) ? 'mt-select2' : ''}}  dynamic attribute_{{$loop->index}}" name="attribute[{{$attribute['id']}}][]"  {{($attribute['select_many'] == 1) ? 'multiple' : ''}}  required style="width: 100%">
                <option value="">Select</option>
                @foreach ($attribute['properties'] as $key => $value)
                    <option value="{{$key}}"  {{( in_array( $key, ( empty($propertiesSelected) ) ? [] : array_unique($propertiesSelected[$attribute['id']]) ) ) ? 'selected' : '' }}>{{$value}}</option>
                @endforeach
            </select>
        </div>
    </div>
    @endif
@endforeach

Answer 1

据我所知，你可以添加一个额外的.field_name，所以你的代码将是例如：

'categories.*.name' => 'required|exists:categories,id'

如果您需要更多选项，也可以参考Validator Doc，它写得非常好。

Answer 2

你必须添加一个custom validation rule，这是一个例子：

在AppServiceProvider方法下的boot类中：

namespace App\Providers;

use Illuminate\Support\ServiceProvider;
use Illuminate\Support\Facades\Validator;

class AppServiceProvider extends ServiceProvider
{

    public function boot()
    {

        // Extend laravel validation rules
        Validator::extend('subcategories_exist', function ($attribute, $categories, $parameters, $validator) {

            // $categories represent the incoming categories value from client
            foreach ($categories as $subCategories) {

                foreach ($subCategories as $category_id) {

                    // check category existence in database
                    return App\Category::where('id', $category_id)->count() === 1;

                }

            }

        });
    }

    ...

}

控制器：

'categories' => 'required|array|subcategories_exist',