django 注释奇怪的行为（按 model.id 分组）

Question

在我的 DRF API 中，我有这样的视图

class ActivityAPI(viewsets.ModelViewSet):
    authentication_classes = (SessionAuthentication, TokenAuthentication)
    serializer_class = ActivitySerializer
    queryset = Activity.objects.order_by('-id').all()
    filter_backends = (DjangoFilterBackend,)
    filter_class = ActivityFilter
    filter_fields = ('name', 'ack', 'developer', 'ack_date', 'ack_by', 'verb')    

    def get_count(self, request, *args, **kwargs):
        queryset = self.filter_queryset(self.get_queryset())
        if CASE_1:
            queryset = queryset.values('verb').annotate(count=Count('verb'))
        if CASE_2:
            queryset = Activity.objects.values('verb').annotate(count=Count('verb'))
        return Response(data=queryset)

在CASE_2中，我得到了我所期望的，这相当于SQL查询SELECTactivity_activity.verb, COUNT(activity_activity.verb) AScountFROMactivity_activityGROUP BYactivity_activity. verbORDER BY NULL

但是当涉及到 CASE_1 时，注释功能按 activity.id 对查询集进行分组，即 SELECTactivity_activity.verb, COUNT(activity_activity.verb) AScountFROMactivity_activity GROUP BYactivity_activity.idORDER BYactivity_activity.idDESC

注意 API 和聚合

都需要基于url 的过滤数据

Answer 1

组非常小，因为您在原始查询集上有 .order_by('-id')。您可以通过空 order_by 或仅按组中使用的字段排序来修复它：

if CASE_1:
    queryset = queryset.values('verb').annotate(count=Count('verb')).order_by('verb')

了解 Aggregation - Interaction with default ordering or order_by()。

django 注释奇怪的行为（按 model.id 分组）

django annotate weird behavavior (group by model.id)

django

django-orm

django-aggregation

python-3.x

django-annotate