Python 如何向django userprofile模型添加新列

我在Django用户身份验证中添加了一个额外的自定义字段

phone

。在那之前，它工作正常。后来，我又添加了一个名为

permissions

的自定义字段。之后，当我尝试访问管理页面时，我会遇到一条错误消息。这是我的

model.py

code

from django.contrib.auth.models import User
from django.db import models
class UserProfile(models.Model):
    # This line is required. Links UserProfile to a User model instance.
    user = models.OneToOneField(User)
    class Meta:
        permissions = (
                       ("ssc_1","can access ssc locked questions"),
                       )
    # The additional attributes we wish to include.
    phone = models.CharField(max_length =20)
    permission = models.IntegerField()   

    # Override the __unicode__() method to return out something meaningful!
    def __unicode__(self):
        return self.user.username

当我发出

python manage.py migrate

命令时，我收到了这个错误消息

return Database.Cursor.execute(self, query, params)
django.db.utils.OperationalError: table "users_userprofile" already exists

注意：我的Django版本是1.6.6

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谢谢

迁移只在django 1.7中引入。在此之前，它一直被用来处理迁移