如何将django模型中的多对多按个人分开？

from django.db import models

class User(models.Model):
    name = models.CharField(max_length=100)
    groups = models.ManyToManyField('Group', through='Membership')

class Group(models.Model):
    name = models.CharField(max_length=100)

class Membership(models.Model):
    user = models.ForeignKey(User, on_delete=models.CASCADE)
    group = models.ForeignKey(Group, on_delete=models.CASCADE)
    is_personal = models.BooleanField(default=False)

user = User.objects.get(id=user_id)
personal_groups = user.groups.filter(membership__is_personal=True)