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我在 Django 上使用 South 迁移时遇到了错误。我在我的模型中包含了几个新字段。我可以跑步python manage.py syncdb，python manage.py schemamigrations retailers但是当我尝试迁移时，我遇到了......

FATAL ERROR - The following SQL query failed: CREATE TABLE "retailers_tag" ("id" integer NOT NULL PRIMARY KEY, "name" varchar(100) NOT NULL, "slug" varchar(50) NOT NULL UNIQUE)
The error was: table "retailers_tag" already exists
ValueError: Cannot import the required field 'autoslug.fields.AutoSlugField'

我的模型如下：

from django.db import models
from django_extensions.db.fields import AutoSlugField

class Tag(models.Model):
    tag = models.CharField(max_length=100)
    slug = AutoSlugField(populate_from='name', unique=True)

    def __unicode__(self):
        return self.tag

class City(models.Model):
    city = models.CharField(max_length=100)
    slug = AutoSlugField(populate_from='name', unique=True)

    def __unicode__(self):
        return self.city

class Listings(models.Model):
    listing = models.CharField(max_length=50)
    description = models.CharField(max_length=500)
    email = models.EmailField(max_length=75)
    url = models.URLField(max_length = 200)
    tag = models.ManyToManyField(Tag)
    city = models.ManyToManyField(City)
    pub_date = models.DateTimeField(auto_now=True)


    def __unicode__(self):
        return self.listing

我是 Django / South 的新手！在此先感谢您的帮助。

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