我目前正在为使用django的客户在网站上工作。我目前遇到一个从未有过的问题。我运行了makemigrations并成功运行，然后在迁移中引发完整性错误“空约束失败”。

困扰我的领域是用户领域，它与django用户模型一对一连接。

class AuthorityUser:
    """
    Represents an authority user
    """
    role = models.CharField(max_length=40,verbose_name='Role')
    user = models.OneToOneField(User,on_delete=models.CASCADE,verbose_name='משתמש')
    authority = models.ForeignKey(Authority,null=True,verbose_name='רשות')
    password_reset_token = models.CharField(max_length=40,blank=True)

    active = models.BooleanField(default=True,verbose_name='פעיל')

    can_create_committee = models.BooleanField(default=False)

    class Meta:
        # Order model instances by first name and last name
        ordering = ('user__first_name','user__last_name')

    def delete(self,*args,**kwargs):
        """
        Delete the components before deleting the model instance
        """
        self.user.delete()
        super().delete(*args,**kwargs)

    def save(self,**kwargs):
        """
        Overrides the Model save method
        """
        if '_' not in self.user.username:
            # Add suffix to the user
            self.user.username = f'{self.user.username}_AU{self.authority.id}'
            self.user.save()

        if not self.password_reset_token:
            # Generate a password token
            self.password_reset_token = uuid.uuid4().hex
        super().save(*args,**kwargs)

django.db.utils.IntegrityError: NOT NULL constraint failed: new__authority_authorityuser.user_id