我正在使用《Tango with Django》学习Django,但是当我输入以下内容时,我一直遇到这个错误:
python manage.py makemigrations rango
python manage.py migrate
这是输出结果:
django.db.utils.IntegrityError: UNIQUE constraint failed: rango_category__new.slug
模型.py:
from django.db import models
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
class Page(models.Model):
category = models.ForeignKey(Category)
title = models.CharField(max_length=128)
url = models.URLField()
views = models.IntegerField(default=0)
def __unicode__(self):
return self.title