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class CalendarViewSetGroup(SnippetViewSetGroup):
    """
    This class defines the Calendar menu, which is only displayed on www and on default sites from other servers.
    """
    items = [EventSeries2ViewSet, EventSponsor2ViewSet, EventTagViewSet, EventSeason2ViewSet, AcademicTermViewSet]
    menu_icon = 'calendar-alt'
    menu_label = 'Calendar'
    menu_name = 'calendar'
    # This puts the Calendar menu just below News.
    menu_order = 110

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class NewsPage(Page):
    # Other fields
    writer = models.CharField(max_length=255, blank=True, default=get_current_user_full_name)
    
    content_panels = Page.content_panels + [
        FieldPanel('writer'),
    ]

# ===================
# Utility Functions

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################################################################################################################
# Replace the wagtaildocs serve() view to change the cache-control header that it returns.
# This prevents any cache besides the user's own browser from storing any potentially confidential document.
################################################################################################################
multitenant_document_serve = etag(document_etag)(cache_control(max_age=3600, private=True)(serve.__wrapped__))


patched_wagtail_urlpatterns = [
    # This overrides the wagtaildocs_serve view.
    re_path(r'^documents/(\d+)/(.*)$', multitenant_document_serve),

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from wagtail.contrib.routable_page.models import RoutablePageMixin
from wagtail.models import Page, PageViewRestriction

from robots_txt.models import RobotsTxtMixin
from ..utils import URLMixin

# Typical cache durations, defined in seconds.
DEFAULT_PAGE_CACHE_TIME = 60 * 5  # 5 minutes
TWENTY_FOUR_HOURS = 60 * 60 * 24

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class CourseIndexPage(Page):
    # ..... fields ......
    base_form_class=CourseIndexPageForm
    
    
class CourseIndexPageForm(WagtailAdminPageForm):

    def __init__(self, *args, **kwargs):
        """
        Sets up the Course selector to treat selecting null for the Edition as setting it to "current".

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class NewsPage(Page):
      ...
      publication_date = models.DateTimeField(
        blank=True,
        null=True,
        help_text="This field will be automatically filled in once this news article is published. "
                  "After that, you may edit it. This date is used to sort articles and is displayed on the teaser."
    )

    exclude_fields_in_copy = [

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import os
import requests
from io import BytesIO
from collections import OrderedDict
from django.core.files import File
from wagtail.models import Collection
from wagtail.documents import get_document_model
from djunk.utils import get_or_generate

from core.logging import logger

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class CourseChangesImporter(object):
  
    def sync_with_cataloger(self, catalog_label, json_data, course_listing_page, dry_run=False):
        courses = json_data.get('courses', [])
        for course in courses:
            proposal_type = course['proposal_type']
            course_number, course_letters = self._split_course_number(course['course_number'])
            if proposal_type == "CHANGE":
                course_page = self._find_current_course_page(course_listing_page, course['copied_from'], dry_run)
                course_page = course_page.get_latest_revision_as_object()

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class CoursePage(Page, ClusterableModel):
    course_number = models.CharField(
        verbose_name='Course Number',
        max_length=256,
        help_text="Only the numeric part",
    )
    course_letters = models.CharField(
        verbose_name='Course Letters',
        max_length=256,
        blank=True,

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The tricky bit is then getting that view used for the "copy". 
We do a lot of patching so it's hard for me to extract a good example of that