Django多对多关系,并通过

我要存储哪个用户邀请了另一个用户加入组…但Django告诉我这是矛盾的,违反了规则(这是有道理的)。

groups.group:中介模型 组成员有多个 用户的外键,即 不明确,不允许。

那么,我如何正确地做到这一点呢?可能是一般关系?可能有效,但似乎有点复杂…以下是我接近它的方式(去掉无关的部分)

from django.contrib.auth.models import User

class UserGroup(models.Model):
    members = models.ManyToManyField(User, through='Group_to_Member')

class UserGroup_to_Member(models.Model):
    group = models.ForeignKey(UserGroup)
    member = models.ForeignKey(User)

    invited_by = models.ForeignKey(User, related_name="group_invited_users")

解决方案

好吧,所以我把你们提供的答案结合了一下(谢谢!)我在互联网上发现的东西加上我自己承认的微不足道的Python Fu:

from django.contrib.auth.models import User

class UserGroup(models.Model):
    # notice there is no member object here
    ... other model data

    def add_member(self, **kwargs):
        g2m = UserGroup_to_Member(group = self,  **kwargs)
        g2m.save()

    def remove_member(self, member):
        g2m = UserGroup_to_Member.objects.get(group=self, member=member)
        g2m.delete()

    # This is not elegant at all, help please? I'm pretty sure it isn't
    # as bad on the database as it looks though.
    def get_members(self):
        g2ms = UserGroup_to_Member.objects.filter(group=self)
        member_ids = [g2m.member.id for g2m in g2ms]
        members = User.objects.none()
        for id in member_ids:
            members = members | User.objects.get(id=id)
        return members

class UserGroup_to_Member(models.Model):
    group = models.ForeignKey(UserGroup)
    member = models.ForeignKey(User)

    invited_by = models.ForeignKey(User, related_name="group_invited_users")