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我有如下的 Django 模型

class Artist(models.Model):
    user = models.ForeignKey(user_model(), related_name="user")
    name = models.CharField(max_length=75)
    surname = models.CharField(max_length=75)
    category = models.ManyToManyField(Category, null=True, blank=True)
    city = models.ForeignKey(City, null=True, blank=True)
    interest = models.ManyToManyField(Interest, null=True, blank=True)
    biography = models.TextField(max_length=500, null=True, blank=True)
    image = models.ImageField(upload_to="media/profile_photos/", null=True, blank=True)
    email = models.EmailField(null=True, blank=True)
    followers = models.ManyToManyField(user_model(),null=True, blank=True,
                                       related_name="follower")

我正在使用模型表单，但是当我尝试在不提供兴趣和城市值的情况下保存表单时，我在调试器中收到以下错误。我重新创建了数据库，还是一样。有任何想法吗 ？？

ipdb> self.errors
{'city': [u'This field is required.'], 'interest': [u'"" is not a valid value for a primary key.']}
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