使用paginate分页后数据处理

public function index(){
    $sql = "";
    $list = "";
    $pagenumber = 20;//默认分页条数
    
    //查询数据
    $list = Db::name('wcmall_type','id,name,sort')->where($sql)->order('sort asc')->paginate($pagenumber,false,['query'=>request()->param()])->each(function($item, $key){
        $wctypeid = $item["id"]; //获取数据集中的id
        $num = Db::name('wcmall_type_attribute')->where("wctypeid='$wctypeid'")->count('id'); //根据ID查询相关其他信息
        $item['num'] = $num; //给数据集追加字段num并赋值
        return $item;
    });
    $page = $list->render();
    
    
    return view('type/index',['list'=>$list,'page'=>$page,'title'=>'商品类型']);
}