属性错误：无法通过用户计费历史记录实例访问管理器

Question

这是我的信号：

@receiver(post_save, sender=settings.AUTH_USER_MODEL)
def create_auth_token(sender, instance=None, created=False, **kwargs):
    """Receiver to create authoriasation tokens for users"""
    if kwargs.get('raw'):
        return  # ignore for loading fixtures
    import pdb; pdb.set_trace()
    if created:
        Token.objects.create(user=instance)
        UserBillingHistory.objects.create(user=instance)
        if settings.NEW_USER_EMAIL is not None:
            send_email(
                "Spotless data - new user",
                "New user with email %s has signed up" % instance.email,
                "Spotless Data<[e-mail]>",
                settings.NEW_USER_EMAIL
                )

这是我的模型：

类用户计费历史记录(模型。型号(：

user = models.ForeignKey(User, on_delete=models.CASCADE)
description = models.TextField(max_length=500, blank=False, default="Free 100Mb on sign-up and Buy $40 and get 100Mb")
cash_amount = models.DecimalField(max_digits=9, decimal_places=2)
data = models.IntegerField(null=False, blank=False)
date = models.DateTimeField(default=timezone.now, blank=False, null=False)
is_confirmed = models.BooleanField(default=False)
job = models.ForeignKey("Job", on_delete=models.SET_NULL, null=True)
@property
def user_can_view(self, user):
    return (self.user == user)
def user_can_edit(self, user):
    return (self.user == user)
def user_can_delete(self, user):
    return (self.user == user)
def get_absolute_url(self):
    return "/userbillinghistorys/%s/" % self.id
def cash_amount(self):
    return "$%s" % 0
def data(self):
    return 100 * 1024 * 1024    
def __unicode__(self):
    return u'%s' % self.description

当我尝试创建新用户注册时，出现以下错误。 属性错误：无法通过用户计费历史记录实例访问管理器

UnicodeEncodeError："charmap"编解码器无法编码 - 字符映射到

默认情况下，此模型将显示内容 data=100*1024*1024 和 cash_amount=0。你能建议一下吗，谢谢。

Answer 1

对于评论中提到的错误，请替换：

def __unicode__(self):
    return "%s" % "Free 100Mb on sign-up and Buy $40 and get 100Mb"

跟：

def __unicode__(self):
    return u"Free 100Mb on sign-up and Buy $40 and get 100Mb"