“‘Question”对象没有属性“”choice_set“”django“”

Question

我试过django投票应用程序，但得到了这个，我的模型包含了外键，但我不明白问题在哪里

from django.db import models

class Question(models.Model):
    question = models.CharField(max_length = 200)
    pub_date = models.DateTimeField('published date')

    def __str__(self):
        return self.question

class Choice(models.Model):
    question = models.ForeignKey(Question, on_delete=models.CASCADE)
    choice_text = models.CharField(max_length=200)
    vote = models.IntegerField(default=0)

    def __str__(self):
        return self.choice_text

下面是视图：

def vote(request , primary_key):
question = get_object_or_404(models.Question, id=primary_key)
try:
    selected_choice = question.choice_set.get(id=request.POST['choice'])
except (KeyError, Choice.DoesNotExist):
    return render(request,'polls/detail.html',{
        'question' : question ,
        'error_message' : "u didn't select a choice."
    })
else:
    selected_choice.vote += 1
    selected_choice.save()
    return HttpResponseRedirect(reverse('polls:results', args = (question.id)))

urls：

urlpatterns = [
re_path(r'^$', views.index , name = 'index'),
re_path(r'^(?P<primary_key>[0-9]+)/$',views.detail, name = 'detail'),
re_path(r'^(?P<primary_key>[0-9]+)/results/$' , views.results , name = 'results'),
re_path(r'^(?P<primary_key>[0-9]+)/vote/$' , views.vote , name = 'vote'),

]

Answer 1

您是否进行了迁移，并在定义了Choice类之后进行了迁移？