Django 2.x Admin的InLine ManyToMany字段的filter_horizo​​n或filter_vertical

Question

这是我的模型关系（摘自Django 2.1官方文档-我的模型是该模型的精确副本，但只有模型名称不同。）：

class Person(models.Model):
    name = models.CharField(max_length=50)

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

class Membership(models.Model):
    group = models.ForeignKey(Group, on_delete=models.CASCADE)
    person = models.ForeignKey(Person, on_delete=models.CASCADE)

这是我的admin.py：

class MembershipInLine(admin.StackedInline):
    model = Membership

class PersonAdmin(admin.ModelAdmin):
    inlines = [
        MembershipInLine,
    ]

我在“人员”页面上得到如下字段： Current view

但是我想拥有这种风格： Desired view

我在official documentation中找到了filter_horizontal和filter_vertical，但是我不知道如何将它们与内联一起使用。我该怎么办？

编辑：

我已经按照文档中所述进行了尝试：

class MembershipInLine(admin.StackedInline):
    model = Membership # (and also tried with = Group.members.through)
    filter_horizontal = ('group', )

但是它抛出：

  

（admin.E020）“ filter_horizo​​ntal [0]”的值必须是“多对多”字段。

Answer 1

有关组的权限，请咨询auth admin面板。尝试类似

class PersonAdmin(admin.ModelAdmin):
    search_fields = ()
    ordering = ()
    filter_horizontal = ('membership',)

    def formfield_for_manytomany(self, db_field, request=None, **kwargs):
        if db_field.name == 'membership':
            qs = kwargs.get('queryset', db_field.remote_field.model.objects)
            # Avoid a major performance hit resolving membership names which
            # triggers a content_type load:
            kwargs['queryset'] = qs.select_related('content_type')
        return super().formfield_for_manytomany(db_field, request=request, **kwargs)

https://github.com/django/django/blob/master/django/contrib/auth/admin.py#L29