Djano分页generic LISTCREATEAPIvi中的条件查询集

Question

我有一个URL，其中有一些查询参数，我已经对这个URL应用了分页。你知道吗

网址.py

url(r'^users/(?P<pk>[0-9]+)/workouts/get/$',
        WorkoutList.as_view(serializer_class=WorkoutSerializer), name='list'),

视图.py

class WorkoutList(generics.ListCreateAPIView):
    queryset = Workout.objects.all()
    serializer_class = WorkoutSerializer
    permission_classes = (UserPermissions,)

    def get_queryset(self):
        query_set = super(WorkoutList, self).get_queryset()
        query_params = self.request.QUERY_PARAMS.dict()
        try:
            date = string_to_date_convertor(query_params['date'])
        except KeyError:
            print 'Exception'
            return Response(status=status.HTTP_406_NOT_ACCEPTABLE)

        if 'date' in query_params:
            query_set = Workout.objects.filter(created__contains=date, user_id = self.kwargs['pk'])

        elif 'date' in query_params and 'exclude_app_install_time' in query_params:
            query_set = Workout.objects.filter(created__contains=date, time_reg = query_params['exclude_app_install_time'])    


        return query_set

现在，我尝试除了块周围的日期，如果日期参数是没有做什么，只是返回4xx Http状态码。如果没有参数，只需返回4xx状态码。你知道吗

如果两个条件块都失败，则返回查询集并执行此查询集

queryset = Workout.objects.all() My Workout tables contain millions of entries and I don't want to return the whole table. That would be catastrophic.

所以我添加了另一个条件块

 elif query_param is None:
       query_set = None

简单地说，如果任何异常或条件块失败，那么只需返回4xx。你知道吗

Answer 1

当任何异常或条件块失败时，可以使用^{}返回EmptyQuerySet。你知道吗

# return empty queryset
queryset = Workout.objects.none()