Django 分页泛型 LISTCREATEAPIview 中的条件 query_set

Question

我有一个 URL，里面有一些 query_params，我已经在这个 URL 上应用了分页。

urls.py

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

views.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

现在我已经尝试除了日期周围的块，如果没有日期参数，什么也不做，只是 return 4xx Http 状态代码。此外，如果没有参数，则只有 return 和 4xx 状态代码。

如果两个条件块都失败，则 returning query_set 并执行此 query_set

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这样的条件块

 elif query_param is None:
       query_set = None

简单来说，如果任何异常或条件块失败，那么只是 return 4xx。

Answer 1

当任何异常或条件块失败时，您可以使用 QuerySet.objects.None() return 和 EmptyQuerySet。

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

Django 分页泛型 LISTCREATEAPIview 中的条件 query_set

Condtional query_set in Djano Pagination generic LISTCREATEAPIview

python

pagination

django-class-based-views

django-rest-framework