Django，Wagtail管理员：通过'through'处理多对多`

我有两个型号，带有至表格，例如：

class A(models.Model):
    title = models.CharField(max_length=500)
    bs = models.ManyToManyField(to='app.B', through='app.AB', blank=True)

    content_panels = [
        FieldPanel('title'),
        FieldPanel('fields'),    # what should go here?
    ]

class AB(models.Model):
    a = models.ForeignKey(to='app.A')
    b = models.ForeignKey(to='app.B')
    position = models.IntegerField()

    class Meta:
        unique_together = ['a', 'b']

尝试保存时出现以下错误：

无法在指定中间模型的ManyToManyField上设置值

---

这个错误对我来说是有道理的。我应该保存AB实例。我只是不确定在Wagtail中实现这一点的最佳方法是什么。

您需要的是一个内嵌面板：

---

我尝试了

InlinePanel

，结果出现了一个关键异常。我缺少的是使用

ParentalKey

&

ClusterableModel

。我认为上面的ParentalKey应该没有“models”

from wagtail.admin.edit_handlers import FieldPanel, InlinePanel
from wagtail.core.models import Orderable
from modelcluster.fields import ParentalKey

# the parent object must inherit from ClusterableModel to allow parental keys;
# this happens automatically for Page models
from modelcluster.models import ClusterableModel

class A(ClusterableModel):
    title = models.CharField(max_length=500)

    content_panels = [
        FieldPanel('title'),
        InlinePanel('ab_objects'),
    ]

class AB(Orderable):
    a = ParentalKey('app.A', related_name='ab_objects')
    b = models.ForeignKey('app.B')
    panels = [
        FieldPanel('b'),
    ]