Group和 用户User是多对多关系

组里面有多个用户

用户也可以属于多个组

…………………….

class Group(m.Model):
id=m.AutoField(‘id’,primary_key=True)
owner_user=m.ForeignKey(User,related_name=’groups_owner’)
members =m.ManyToManyField(User,through=’Membership’)
name=m.CharField(max_length=50)
parent=m.ForeignKey(‘self’,’id’,null=True, blank=True)
def __unicode__(self):
return self.name

class Membership(m.Model):
member = m.ForeignKey(User)
group = m.ForeignKey(Group)
……………………

>>> xugang1= Person.objects.create(name=”Ringo Starr”)
>>> xugang2= Person.objects.create(name=”Paul McCartney”)
>>> beatles = Group.objects.create(name=”The Beatles”)
>>> m1 = Membership(person=ringo, group=beatles)

>>> m1.save() //Ok 到数据库里面去了