Set wagtail (home)pages programmatically during Django Migrations

create_wagtail_pages_through_migration

# -*- coding: utf-8 -*-
from __future__ import unicode_literals

from django.db import migrations, models
from wagtail.wagtailcore.models import Page, Site


def forwards_func(apps, schema_editor):

    HomePage = apps.get_model('website', 'HomePage')
    NewsIndexPage = apps.get_model('website', 'NewsIndexPage')
    NewsPage = apps.get_model('website', 'NewsPage')
    NewsTagIndexPage = apps.get_model('website', 'NewsTagIndexPage')

    try:
        default_home = Page.objects.filter(title="Welcome to your new Wagtail site!")[0]
        default_home.slug = "home-old"
        default_home.save_revision().publish()
        default_home.save()
    except:
        pass

    home_page = HomePage(
        title="Home",
        slug="home",
    )

    news_index_page = NewsIndexPage(
        title="News",
        slug="news"
    )

    news_page = NewsPage(
        title="This is a News Page",
        date="2017-08-15",
        slug="news-article-1"
    )

    tag_index_page = NewsTagIndexPage(
        title="Tags",
        slug="tags"
    )


    # Set Home Page as child of root
    root = Page.objects.get(id=1).specific
    root.add_child(instance=home_page)

    # Save and publish Home Page
    revision = home_page.save_revision()
    revision.publish()
    home_page.save()

    # Set Home Page as root page for Site
    site = Site.objects.get(id=1)
    site.root_page = home_page
    site.save()


    # Add News Index as child of Home Page
    home_page.add_child(instance=news_index_page)
    news_index_page.save_revision().publish()
    news_index_page.save()

    # Add News Page as child of News Index
    news_index_page.add_child(instance=news_page)
    news_page.save_revision().publish()
    news_page.save()

    # Add Tag Index as child of Home Page
    home_page.add_child(instance=tag_index_page)
    tag_index_page.save_revision().publish()
    tag_index_page.save()


    try:
        default_home = Page.objects.filter(title="Welcome to your new Wagtail site!")[0]
        default_home.delete()
    except:
        pass


def reverse_func(apps, schema_editor):

    current_home_page = Page.objects.get(slug="home")
    current_home_page.slug = "home-old"
    current_home_page.save_revision().publish()
    current_home_page.save()

    default_home_page = Page(
        title="Welcome to your new Wagtail site!",
        slug="home"
    )

    # Free up the /home slug, but do not delete the old Home Page
    current_home_page = Page.objects.get(slug="home")
    current_home_page.slug = "home-old"
    current_home_page.save_revision().publish()
    current_home_page.save()

    default_home_page = Page(
        title="Welcome to your new Wagtail site!",
        slug="home"
    )

    # Set default Home Page as child of root
    root = Page.objects.get(id=1).specific
    root.add_child(instance=default_home_page)

    # Save default Home Page
    revision = default_home_page.save_revision()
    revision.publish()
    default_home_page.save()

    # Set default Home Page as root page for Site
    site = Site.objects.get(id=1)
    site.root_page = default_home_page
    site.save()

    # Delete current Home Page (and everything beneath it!)
    current_home_page.delete()


class Migration(migrations.Migration):

    dependencies = [
        ('website', '0007_some_other_migration'),
    ]

    operations = [
        migrations.RunPython(forwards_func, reverse_func),
    ]

Can also be created as a management command instead

Apparently, during tests with setting root_page for a site object, there is an Internal server error if you make a call to site.save(). If the root_page you are trying to add has StreamField data, it fails with the [honestly useless] internal server error page.