例如，我想使用wagtail建立一个电子商务网站，其中一个组件是订单。我认为顺序不应该是wagtail Page，而是简单的Django模型，见下面的代码。

from django.db import models

from wagtail.admin.edit_handlers import (
    FieldPanel,
    StreamFieldPanel,
    MultiFieldPanel,
    InlinePanel,
)
from wagtail.core.fields import RichTextField
from wagtail.core.models import Page

# Since product details are shown to users, so need to have a Page for it.
class XyzProductPage(Page):
    template = "product/product_page.html"

    name = models.CharField(max_length=100)
    desc = RichTextField(blank=False, null=True)

    content_panels = Page.content_panels + [
        FieldPanel("name"),
        FieldPanel("desc"),
    ]

class XyzOrderedProduct(models.Model):
    product = models.ForeignKey(
        "XyzProductPage", on_delete=models.CASCADE, related_name="+"
    )
    order = models.ForeignKey(
        "XyzOrder", on_delete=models.CASCADE, related_name="ordered_products"
    )

# Orders are not shown to users, only for internal use, so use Django model
class XyzOrder(models.Model):
    panels = [
        # and per each order, I want to display all ordered products on wagtail admin UI,
        # so I try to use this MultiFieldPanel, but doesn't seem to work, why?
        MultiFieldPanel(
            [InlinePanel("ordered_products", label="Ordered Product",)],
            heading="Ordered Product(s)",
        ),
    ]

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我还为上面的Django模型定义了ModelAdmin，所以我可以在wagtail管理界面上看到它们。
我的问题是
1.什么时候使用wagtail页面模型，什么时候使用Django模型？在上面的例子中，订单被定义为Django模型，或者我应该使用Page？
1.如何正确使用Django模型的面板？我看到一些教程，我可以使用Django模型的面板，但在上面的代码中，我想在每个订单中列出所有订购的产品（即XyzOrder）在wagtail管理界面上，但它不工作。
1.如何选择多个订单并批量删除？看起来wagtail admin不支持Django模型的批量选择和删除，但Django admin有。那么，我们如何进行批量选择和删除呢？