我对“添加简单管理电子邮件、助手、站点地图等”一章中的抽象模型有问题(hellowebapp中间书籍) 这是我的模型.py代码:
from django.contrib.auth.models import User
from django.db import models
class Timestamp(models.Model):
created = models.DateTimeField(auto_now_add=True)
updated = models.DateTimeField(auto_now=True)
class Meta:
abstract = True
class Thing(Timestamp):
name = models.CharField(max_length=225)
class Thing(models.Model):
name = models.CharField(max_length=225)
description = models.TextField()
slug = models.SlugField(unique=True)
user = models.OneToOneField(User, blank=True, null=True)
def get_absolute_url(self):
return "/things/%s/" % self.slug
class Social(models.Model):
SOCIAL_TYPES = (
('twitter','Twitter'),
('facebook','Facebook'),
('pinterest','Pinterest'),
('instagram','Instagram'),
)
network = models.CharField(max_length=255, choices=SOCIAL_TYPES)
username = models.CharField(max_length=255)
thing = models.ForeignKey(Thing,related_name="social_accounts")
class Meta:
verbose_name_plural = "Social media links"
当我跑的时候
^{pr2}$错误消息显示:
/helloApp/venv/lib/python2.7/site-packages/django/db/models/base.py:309: RuntimeWarning: Model 'collection.thing' was already registered. Reloading models is not advised as it can lead to inconsistencies, most notably with related models.
new_class._meta.apps.register_model(new_class._meta.app_label, new_class)
No changes detected
不像书中那样:
You are trying to add a non-nullable field 'added' to thing without a defaul,,,,,,,
任何回答都会非常感谢你!在
目前没有回答
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