AttributeError: Class1 object has no attribute 'class2_set' with ManyToMany Field Django

Question

型号：

class Groupe(models.Model):
    name = models.CharField(max_length=255)
    autoAddingMail = models.CharField(max_length=255,null=True,blank=True)
    association = models.ForeignKey(
        User,
        limit_choices_to={'role': 'ASSOCIATION'},
        null=False,
        on_delete=models.CASCADE,
        related_name='association'
    )
    students = models.ManyToManyField(
        User,
        limit_choices_to={'role': 'STUDENT'},
        related_name='students'
    )
    events = models.ManyToManyField(
        Event
    )

    class Meta:
        unique_together = ("name","association")

    REQUIRED_FIELDS = ['name','association']

    def __str__(self):
        """ Return string representation of our user """
        return self.name

单元测试：

groupe = event.groupe_set.get(name="name",association=association) <= 工作正常

groupe = student.groupe_set.get(name="name",association=association) <= 无效

错误： AttributeError: 'User' object has no attribute 'groupe_set'

我不明白为什么学生没有属性 groupe_set 但活动有

我已阅读有关 ManyToMany 字段的文档，但没有找到答案。

Answer 1

而不是

groupe = student.groupe_set.get(name="name",association=association)

我不得不使用：

groupe = student.students.get(name="name",association=association)

因为related_name。感谢@iklinac 的评论。

AttributeError: Class1 object has no attribute 'class2_set' with ManyToMany Field Django

AttributeError: Class1 object has no attribute 'class2_set' with ManyToMany Field Django

django

manytomanyfield

django-tests