如何修复Django的视图没有返回HttpResponse对象。结果却一个也没有?

2024-03-29 10:23:26 发布

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我得到以下错误:

The view KSUvity.authentication.views.registerAttendee didn't return an HttpResponse object. It returned None instead

我想是因为我的函数有逻辑错误。我有几个if和else语句来检查几个条件。你知道吗

这是中的函数视图.py地址:

def registerAttendee(request,pk):
    act = Activity.objects.get(pk=pk)
    act.save()
    attendee, _ = Attendee.objects.get_or_create(student=request.user)

    volunteer = Volunteer.objects.filter(student=request.user)

    ActvsStudentAttending=Activity.objects.filter(attendee=attendee)
    ActvsStudentVolunteering=Activity.objects.filter(volunteer=volunteer)

    if act.volunteer.filter(student=request.user).exists():
        messages.error(request, 'You\'re already registered as a volunteer for this activity!', extra_tags='alert')
        return redirect('home/#work')

    elif act.attendee.filter(student=request.user).exists():
        messages.warning(request, 'You\'re already registered as an attendee for this activity!', extra_tags='alert')
        return redirect('home/#work')

    elif ActvsStudentAttending.exists():
        for x in ActvsStudentAttending:
            if x.startDate.date() == act.startDate.date():
                messages.error(request, 'You\'re already registered in the '+x.title+' activity that is held on the same day as '+act.title+'!', extra_tags='alert')
                return redirect('home/#work')

    elif ActvsStudentVolunteering.exists():
        for x in ActvsStudentVolunteering:
            if x.startDate.date() == act.startDate.date():
                messages.error(request, 'You\'re already registered in the '+x.title+' activity that is held on the same day as '+act.title+'!', extra_tags='alert')
                return redirect('home/#work')
    else:
        act.attendee.add(attendee)
        messages.success(request, 'You\'re successfully registered as an attendee!', extra_tags='alert')
        return redirect('home/#work')

引发错误的原因是for循环中的内部if吗?如果是,我应该如何修复它?这些案子我没有别的办法,所以我不知道我缺了什么。我必须检查所有的条件,然后才能进入最后的其他添加到模型。你知道吗

我对Django和Python还不熟悉,所以请原谅。你知道吗

这就是我所拥有的型号.py地址:

class Activity(models.Model):
    type = models.CharField(max_length=50, default="")
    title = models.CharField(max_length=200, default="")
    description = models.CharField(max_length=500)
    owner = models.ForeignKey(User, related_name="owner")
    college = models.CharField(max_length=200)
    location = models.CharField(max_length=200)
    room = models.CharField(max_length=200)
    startDate = models.DateTimeField(null=True, blank=True)
    endDate = models.DateTimeField(null=True, blank=True)
    attendee = models.ManyToManyField(Attendee, related_name="attendees",null=True, blank=True)
    volunteer = models.ManyToManyField(Volunteer, related_name="volunteers",null=True, blank=True)

class Attendee(models.Model):
    student = models.ForeignKey(User, related_name="attendee")

class Volunteer(models.Model):
    student = models.ForeignKey(User, related_name="volunteer")

Tags: truereturnifobjectsmodelsrequestfilteract
1条回答
网友
1楼 · 发布于 2024-03-29 10:23:26

删除else并取消其代码块的缩进。这将确保如果您的代码进入较早的elif块,但从未通过循环中的内部if条件,则始终执行这部分代码:

if ...:
    # ...
elif ...:
    # ...
# remove the 'else', so that this will always run if your view function 
# did not return from any of the earlier '[el]if' blocks
act.attendee.add(attendee)
messages.success(request, 'You\'re successfully registered as an attendee!', extra_tags='alert')
return redirect('home/#work')

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