[英]Generic relation in django, queryset with aggregate
我在模型中使用django 1.6和泛型關系。 我在模型中的aggregate
函數有問題:
這是我觀點的一部分:
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']
我在這個地方遇到錯誤:
minmax_sales_events_activities = sales_events_activities.aggregate(Min('start'), Max('end'))
錯誤:
no such table: events_saleandcycle
但是數據庫中有表(我使用sqlite),其字段如下:id,content_type_id,object_id,位置,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)
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