Question

我在模型中使用django 1.6和泛型关系。我在模型中遇到了aggregate函数的问题：

以下是我观点的一部分：

class EventListView(PageContextMixin, ListView):
    model = Activity
    template_name = 'events/eventlist.html'

    def get_queryset(self):
        seasons = Season.objects.all()
        if not self.request.user.is_superuser:
            seasons = seasons.filter(is_active=True)
            active_seasons_ids = list(IsActiveFlag.objects.exclude(is_active=False).values_list('id', flat=True))
            seasons = list(Season.objects.filter(isactiveflags__id__in=active_seasons_ids))
        minmax = seasons.aggregate(Min('start'), Max('end'))
        min_date = minmax['start__min']
        max_date = minmax['end__max']

        active_sale_and_cycles_ids = list(SaleAndCycle.objects.exclude(is_sale_active=False).values_list('id', flat=True))
        filters_sale = Q(sale_and_cycles__id__in=active_sale_and_cycles_ids)
        active_is_cyclic_event_ids = list(SaleAndCycle.objects.exclude(is_cyclic_event_active=False).values_list('id', flat=True))
        filters_cycle = Q(sale_and_cycles__id__in=active_is_cyclic_event_ids)
        sales_events_activities = Activity.objects.filter(Q(filters_sale, online=True) | Q(filters_cycle, online=True))   
        sales_events_ids = sales_events_activities.values_list('id', flat=True)
        minmax_sales_events_activities = sales_events_activities.aggregate(Min('start'), Max('end'))
        max_date_sales_events_activities = minmax_sales_events_activities['end__max']

我在这个地方收到错误：

minmax_sales_events_activities = sales_events_activities.aggregate(Min('start'), Max('end'))

错误：

no such table: events_saleandcycle

但是数据库（我使用sqlite）中的表包含字段：id，content_type_id，object_id，position，is_sale_active，is_cyclic_event_active，cycle_link

class SaleAndCycle(SortableVAExtra):
    is_sale_active = models.BooleanField(default=False)
    is_cyclic_event_active = models.BooleanField(default=False)
    cycle_link = models.CharField(max_length=255, null=True, blank=True)

    def __unicode__(self):
        return str(self.is_sale_active)

Answer 1

对Django 1.6有closed issue描述注释失败（聚合）。带有修复的relevant commit仅存在于Django 1.7a中。

我担心你唯一的机会是升级到Django 1.7。

django中的通用关系，带有聚合

1 个答案: