laravel-admin 多级搜索 123是一个3级联动145也是一个3级联动 这两个3级联动的顶级都是1 如何实现他们的多重联动？

$grid->filter( function( $filter ) {
$filter->disableIdFilter();

$url = url( ‘get/natu/natural’ );

$unit = url( ‘get/natu/equnit’);

$urlty = url( ‘get/natu/type’ );

$urlar = url( ‘get/natu/ariety’ );
$filter->equal( ‘area_id’ , __( ‘分区’ ) )
->select(PublicModel::getAllAreaId()
)->loads( [‘natural_id’,’res_type_id’],[$url,$urlty]);

$filter->equal( ‘natural_id’ , __( ‘ 区域’ ) )
->select(
PublicModel::getNaturn()
)->load(‘device_group’,$unit);
$filter->equal( ‘device_group’ , __( ‘设备组’ ) )
->select(
PublicModel::getDeviceGroup()
); $filter->equal(‘res_type_id’, __(‘资源类别’))
->select(
config(‘myconfig.config.natural_type’)
)->load(‘ariety’,$urlar);
$filter->equal(‘ariety’, __(‘资源品种’))->select(
PublicModel::getAriety()
); } );