我有2个模特
class Vhost(models.Model):
dns = models.ForeignKey(DNS)
user = models.ForeignKey(User)
extra = models.TextField()
class ApplicationInstalled(models.Model):
user = models.ForeignKey(User)
added = models.DateTimeField(auto_now_add=True)
app = models.ForeignKey(Application)
ver = models.ForeignKey(ApplicationVersion)
vhost = models.ForeignKey(Vhost)
path = models.CharField(max_length=100, default="/")
def delete(self):
#
# remove the files
#
print "need to remove some files"
super(ApplicationInstalled, self).delete()
如果我执行以下操作
>>> vhost = Vhost.objects.get(id=10)
>>> vhost.id
10L
>>> ApplicationInstalled.objects.filter(vhost=vhost)
[<ApplicationInstalled: http://wiki.jy.com/>]
>>> vhost.delete()
>>> ApplicationInstalled.objects.filter(vhost=vhost)
[]
正如您所看到的,有一个应用程序安装的对象链接到vhost但是当我删除vhost时,应用程序安装的对象已经消失,但打印永远不会被调用。
任何简单的方法都可以在不重复vhost删除对象的情况下执行此操作吗?
解决方案
def delete_apps(sender, **kwargs):
obj = kwargs['instance']
print "need to delete apps"
pre_delete.connect(delete_apps, sender=ApplicationInstalled)
答案 0 :(得分:5)
自从django得到signals以来,我发现我几乎不需要覆盖保存/删除。
无论您需要做什么,都可以通过pre_delete或post_delete信号完成。
在这种情况下,您似乎想要在pre_delte信号中delete in bulk。