我尝试为我的Navigation模型创建一个工厂，但是，这里的top_bar字段没有创建。该问题与URLChoiceStreamFactory相关，但无法解决。

models.py

from wagtail.models import Page
from wagtail import blocks
from django.db import models
from modelcluster.models import ClusterableModel
from wagtail.admin.panels import FieldPanel
from wagtail.models import PreviewableMixin
from wagtail.snippets.models import register_snippet
from django.utils.translation import gettext_lazy as _
from wagtail.fields import StreamField
from django import forms

class URLBlock(blocks.FieldBlock):
    def __init__(
            self,
            required=True,
            help_text=(
                    "Either a relative URL that begins with a forward slash or an absolute URL that begins with http, https, "
                    "tel, or mailto."
            ),
            max_length=None,
            min_length=None,
            **kwargs,
    ):
        self.field = forms.CharField(
            required=required,
            help_text=help_text,
            max_length=max_length,
            min_length=min_length,
        )
        super().__init__(**kwargs)

    class Meta:
        icon = "site"

class HomePage(Page):
    pass

class URLChoiceStream(blocks.StreamBlock):
    internal = blocks.PageChooserBlock(icon="doc-empty-inverse")

    class Meta:
        max_num = 1

class LinkBlock(blocks.StructBlock):
    name = blocks.CharBlock(max_length=128)
    url = URLChoiceStream()

    class Meta:
        icon = "link"
        label = _("Link")

class TopBar(blocks.StructBlock):
    title = blocks.CharBlock(label=_("Title"))
    top_bar_links = blocks.ListBlock(LinkBlock(), max_num=5)

    panels = [
        FieldPanel("title"),
        FieldPanel("top_bar_links"),
    ]

    class Meta:
        icon = "resubmit"

@register_snippet
class Navigation(ClusterableModel, PreviewableMixin):
    name = models.CharField(
        unique=True,
        max_length=256,
        help_text=_("This is used for internal reference only."),
    )
    top_bar = StreamField(
        [("top_bar", TopBar())],
        max_num=1,
        verbose_name=_("Top Bar"),
        null=True,
        blank=True,
        use_json_field=True,
    )

    panels = [
        FieldPanel("name"),
        FieldPanel("top_bar"),
    ]

    def __str__(self):
        return self.name

工厂.py

from home.models import Navigation, TopBar, LinkBlock, URLChoiceStream, HomePage
import factory
import wagtail_factories
from faker import Faker

faker = Faker()

class HomePageFactory(wagtail_factories.PageFactory):
    class Meta:
        model = HomePage

class HomePageChooserBlockFactory(wagtail_factories.PageChooserBlockFactory):
    page = factory.SubFactory(HomePageFactory)

class URLChoiceStreamFactory(wagtail_factories.StreamBlockFactory):
    internal = factory.SubFactory(HomePageChooserBlockFactory)

    class Meta:
        model = URLChoiceStream

class LinkBlockFactory(wagtail_factories.StructBlockFactory):
    name = factory.Faker("sentence", nb_words=2, variable_nb_words=False)
    url = factory.SubFactory(URLChoiceStreamFactory)

    class Meta:
        model = LinkBlock

class TopBarFactory(wagtail_factories.StructBlockFactory):
    title = faker.word()
    top_bar_links = wagtail_factories.ListBlockFactory(LinkBlockFactory)

    class Meta:
        model = TopBar

class NavFactory(factory.django.DjangoModelFactory):
    name = faker.name()
    top_bar = wagtail_factories.StreamFieldFactory(
        {
            "top_bar": factory.SubFactory(TopBarFactory),
        },
    )

    class Meta:
        model = Navigation

我调试了这个问题，HomePageFactory正在创建，但URLChoiceStreamFactory没有。Wagtail-factories文档非常小。无法在文档中找到相关部件。