Django：OneToOneField-RelatedObjectDoesNotExist

Question

我的模型中有以下两个类：

class Answer(models.Model):
    answer = models.CharField(max_length=300)
    question = models.ForeignKey('Question', on_delete=models.CASCADE)

    def __str__(self):
        return "{0}, view: {1}".format(self.answer, self.answer_number)


class Vote(models.Model):
    answer = models.OneToOneField(Answer, related_name="votes", on_delete=models.CASCADE)
    users = models.ManyToManyField(User)

    def __str__(self):
        return str(self.answer.answer)[:30]

在外壳中，我得到第一个答案：

>>> Answer.objects.all()[0]
<Answer: choix 1 , view: 0>

我想获得投票对象：

>>> Answer.objects.all()[0].votes
Traceback (most recent call last):
  File "<console>", line 1, in <module>
  File "C:\Users\Hippolyte\AppData\Roaming\Python\Python38\site-packages\django\db\models\fields\related_descriptors.py", line 420, in __get__
    raise self.RelatedObjectDoesNotExist(
questions.models.Answer.votes.RelatedObjectDoesNotExist: Answer has no votes.

但是发生错误。

我不明白为什么related_name无法识别。你能帮我吗？

Answer 1

您在这里使用了OneToOneField。因此，这意味着每个Vote指向different

Answer 2

通过查询Answer模型而不使用OneToOne关系来检查Vote是否具有[C0