教程看到这 http://www.tangowithdjango.com/book17/chapters/models_templates.html，出错了

› Django Project

› Django REST Framework

This topic created in 3886 days ago, the information mentioned may be changed or developed.

from django.template.defaultfilters import slugify

class Category(models.Model):
        name = models.CharField(max_length=128, unique=True)
        views = models.IntegerField(default=0)
        likes = models.IntegerField(default=0)
        slug = models.SlugField(unique=True)

        def save(self, *args, **kwargs):
                self.slug = slugify(self.name)
                super(Category, self).save(*args, **kwargs)

        def __unicode__(self):
                return self.name

添加一个 slugField, 然后 migrate 的时候出错了 django.db.utils.IntegrityError: UNIQUE constraint failed: rangocategory_new.slug,但是我把数据库清空了， migrate 就又可以了，是什么原因呢？

2 replies • 2015-10-07 13:43:29 +08:00

virusdefender

Oct 5, 2015

slug = models.SlugField(unique=True)是 Unique 的，里面的数据只能出现一次。

zhangyi2099

Oct 7, 2015 via iPhone

@virusdefender 教程里没提到会出错， Google 好久没找到，还有什么办法解决这个问题？