我有这个错误,我该如何解决?
get() returned more than one Event -- it returned 2!
你们能帮我理解这意味着什么吗?也许可以提前告诉我将来如何避免这个错误?
型号
class Event (models.Model):
name = models.CharField(max_length=100)
date = models.DateField(default='')
dicript = models.CharField(max_length=50, default='Описание отсутствует')
category = models.ForeignKey(Category,on_delete=models.CASCADE)
adress = models.TextField(max_length=300)
user = models.ForeignKey(User,related_name="creator",null=True)
subs = models.ManyToManyField(User, related_name='subs',blank=True)
@classmethod
def make_sub(cls, this_user, sub_event):
event, created = cls.objects.get_or_create(
user=this_user
)
sub_event.subs.add(this_user)
观点
def cards_detail (request,pk=None):
# if pk:
event_detail = Event.objects.get(pk=pk)
subs = event_detail.subs.count()
# else:
# return CardsView()
args = {'event_detail':event_detail,'subs':subs}
return render(request,'events/cards_detail.html',args)
class CardsView (TemplateView):`
template_name = 'events/cards.html'
def get (self,request):
events = Event.objects.all()
return render(request,self.template_name,{'events':events })
def subs_to_event (request,pk=None):
event = Event.objects.filter(pk=pk)
Event.make_sub(request.user,event)
return redirect('events:cards')
最佳答案
from django.core.exceptions import ObjectDoesNotExist, MultipleObjectsReturned
try:
instance = Instance.objects.get(name=name)
except (ObjectDoesNotExist, MultipleObjectsReturned):
pass
get() 如果找到多个对象,则引发 MultipleObjectsReturned
,更多信息 here .
该错误是由 event_detail = Event.objects.get(pk=pk)
引起的,请检查您的事件 pk 是否唯一。
关于python - Django get() 返回了不止一个,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/44620205/