Wagtail Django管理员对orderable中的多个图像进行建模

from django.db import models
from wagtail.images.models import Image
from wagtail.admin.edit_handlers import FieldPanel, InlinePanel
from wagtail.core.models import Orderable

class MyImage(Orderable):
    image = models.ForeignKey(
        Image,
        on_delete=models.CASCADE,
        related_name='+'
    )
    caption = models.CharField(max_length=255)

    panels = [
        ImageChooserPanel('image'),
        FieldPanel('caption'),
    ]

class MyPage(Page):
    # other fields and panels

    content_panels = Page.content_panels + [
        InlinePanel('my_images', label="Images"),
    ]

    promote_panels = Page.promote_panels

    class Meta:
        verbose_name = "My Page"

MyPage.content_panels += [
    InlinePanel('my_images', label="Images"),
]

MyPage.promote_panels = Page.promote_panels

class Meta:
    verbose_name = "My Page"