自定义 Laravel Nova 多级 Select

use Alvinhu\ChildSelect\ChildSelect;

public function fields(Request $request)
    {
        return [

            ID::make()->sortable(),

            Select::make('Country')
                ->options(Country::all()->mapWithKeys(function ($country) {
                    return [$country->id => $country->name];
                }))
                ->rules('required'),

            ChildSelect::make('City')
                ->parent('country')
                ->options(function ($value) { 
                    City::whereCountry($value)->get()->mapWithKeys(function ($city) {
                        return [$city->id => $city->name];
                    });
                })
                ->rules('required'),
        ];
    }
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