问题

前端列表在第3页进行搜索的时候，当搜索的结果数据小于20个的时候，drf的view_set的list接口会报NotFound: Invalid page。
想要的效果是在第N页搜索的时候，若数据足够，则停留在第N页，不足则停留在最后一页。

上代码

视图为

python">class HistoryViewSet(ReModelViewSet):
    queryset = History.objects.all()
    serializer_class = HistorySerializer
    filter_class = HistoryFilter
    http_method_names = ['get']

作用查询历史日志列表
api接口信息为：

Request URL: http://127.0.0.1:8000/history/?name=&eta_gte=&eta_lte=&page=1&page_size=10&state=
Request Method: GET

api返回值

python">{
    "message": "success",
    "code": "OK",
    "data": {
        "count": 22,
        "info": [
            {
                "id": 21,
                "process_id": 3,
                "name": "aaaaaaa",
                "state": "error",
                "eta": "2020-10-21 14:54:30",
                "create_time": "2020-10-22 06:00:04",
                "start_time": "2020-10-21 14:53:58"
            },
            {
                "id": 22,
                "process_id": 4,
                "name": "vv",
                "state": "success",
                "eta": "2020-10-21 14:59:42",
                "create_time": "2020-10-22 06:00:04",
                "start_time": "2020-10-21 14:59:43"
            }
        ]
    },
    "result": true
}

刨析问题

接口请求过来的时候会执行到
rest_framework.mixins.ListModelMixin#list这个函数，
执行到断点位置就报错了。

进入paginate_queryset查看
跳入这里
rest_framework.generics.GenericAPIView#paginate_queryset

再进一步查看rest_framework.pagination.PageNumberPagination#paginate_queryset

执行到这个断点位置发生了问题。

通过查看代码可以发现解决page_number的值问题就OK了。

解决方法

重写list

python">def my_rep_list(obj, request, *args, **kwargs):
    queryset = obj.filter_queryset(obj.get_queryset())
    total = len(queryset)
    page_size = int(request.query_params['page_size'])
    if total == 0:
        request.query_params['page'] = 1
    else:
        if int(request.query_params['page']) * (page_size - 1) >= total:
            request.query_params['page'] = int(math.ceil(float(total) / page_size))
    page = obj.paginate_queryset(queryset)
    if page is not None:
        serializer = obj.get_serializer(page, many=True)
        return obj.get_paginated_response(serializer.data)

class HistoryViewSet(ReModelViewSet):
    queryset = History.objects.all()
    serializer_class = HistorySerializer
    filter_class = HistoryFilter
    http_method_names = ['get']
    
	def list(self, request, *args, **kwargs):
        return my_rep_list(self, request, *args, **kwargs)