python-3.x - field_name = ordering[0].lstrip('-') throws IndexError: tuple index out of range in DRF rest_framework\pagination.py

Question

使用 DRF 的 CursorPagination 时出现错误 IndexError: tuple index out of range。我的代码-

class CursorSetPagination(CursorPagination):
    page_size = 10
    page_size_query_param = 'page_size'
    ordering = '-created_at' 


class WalletCreditViewset(viewsets.ReadOnlyModelViewSet):

    authentication_classes = [JWTAuthentication]
    permission_classes = [IsAuthenticated]
    pagination_class = CursorSetPagination 
    serializer_class =  WalletCreditSerializer

    def get_queryset(self):
        queryset = PaymentOrder.objects.filter(user=self.request.user)

        return queryset

当特定用户的数据库表中的条目与 page_size 的值交叉时，就会出现错误。

例如，如果某个用户有 5 个付款订单，则不会出现错误，但是当同一用户跨 10 个付款订单时，则会发生此错误。

Answer 1

我认为您必须在查询集中订购数据，而不是在分页中。
例如：

class CursorSetPagination(CursorPagination):
    page_size = 10
    page_size_query_param = 'page_size'


class WalletCreditViewset(viewsets.ReadOnlyModelViewSet):

    authentication_classes = [JWTAuthentication]
    permission_classes = [IsAuthenticated]
    pagination_class = CursorSetPagination 
    serializer_class =  WalletCreditSerializer

    def get_queryset(self):
        queryset = PaymentOrder.objects.filter(user=self.request.user).order_by("-created_at")

        return queryset