为数据分页后最外层数据结构不允许更改搞出来的花活儿

$list = $model->newFromBuilder(['custom_builder' => new CustomQueryBuilder($model->getQuery(),$model)])
  ->getAttribute('custom_builder')
  ?->appendPageData(['custom_field' => $noReadCount])
  ->orderBy('created_time','DESC')
  ->paginate($request->get('per_page'));

重写Illuminate\Database\Query\Builder中的paginate方法
重写Illuminate\Database\Concerns\BuildsQueries复用类中paginator方法
重写Illuminate\Pagination\LengthAwarePaginator 重写toArray方法

{
    "code": 200,
    "data": {
        "current_page": 1,
        "data": []
        }
        "first_page_url": "****",
        "from": 1,
        "last_page": 9,
        "last_page_url": "***",
        "links": [
            {
                "url": null,
                "label": "&laquo; 上一页",
                "active": false
            },
            {
                "url": "****,
                "label": "1",
                "active": true
            },
            {
                "url": "****",
                "label": "下一页 &raquo;",
                "active": false
            }
        ],
        "next_page_url": "***",
        "path": "****",
        "per_page": "1",
        "prev_page_url": null,
        "to": 9,
        "total": 9,
        "custom_field": 3
}