django - 访问 Django 中介模型值

Question

我有一个简单的问题。使用上面 django 的示例。例如，我如何从组中的人员那里获取 inform_reason ？或该人到所有群组的所有加入日期？谢谢。

class Person(models.Model):
    name = models.CharField(max_length=128)

    def __unicode__(self):
        return self.name

class Group(models.Model):
    name = models.CharField(max_length=128)
    members = models.ManyToManyField(Person, through='Membership')

    def __unicode__(self):
        return self.name

class Membership(models.Model):
    person = models.ForeignKey(Person)
    group = models.ForeignKey(Group)
    date_joined = models.DateField()
    invite_reason = models.CharField(max_length=64)

Answer 1

您需要查询您的Membership 模型，如下所示:

memberships = Membership.objects.filter(person=person, group=group)
for membership in memberships:
    membership.invite_reason

或者，您可以根据关系进行查询:

memberships = person.membership_set.filter(group=group)
for membership in memberships:
    membership.invite_reason