Remove Page & Site models from Django admin

- added instructions to release notes on how to reinstate on a per project basis
- Resolves #5703

CHANGELOG.txt

@@ -9,16 +9,17 @@ Changelog
  * Combine flake8 configurations (Sergey Fedoseev)
  * Improved diffing behavior for text fields (Aliosha Padovani)
  * Improve contrast of disabled inputs (Nick Smith)
- * Added ``get_document_model_string`` function (Andrey Smirnov)
+ * Added `get_document_model_string` function (Andrey Smirnov)
  * Added support for Cloudflare API tokens for frontend cache invalidation (Tom Usher)
  * Added `ancestors` field to pages endpoint in admin API (Karl Hobley)
+ * Removed Django admin management of `Page` & `Site` models (Andreas Bernacca)
  * Fix: Rename documents listing column 'uploaded' to 'created' (LB (Ben Johnston))
  * Fix: Submenu items longer then the page height are no longer broken by the submenu footer (Igor van Spengen)
  * Fix: Unbundle the l18n library as it was bundled to avoid installation errors which have been resolved (Matt Westcott)
  * Fix: Prevent error when comparing pages that reference a model with a custom primary key (Fidel Ramos)
- * Fix: Moved ``get_document_model`` location so it can be imported when Models are not yet loaded (Andrey Smirnov)
+ * Fix: Moved `get_document_model` location so it can be imported when Models are not yet loaded (Andrey Smirnov)
  * Fix: Fixed incorrect HTML escaping of Jinja2 form templates for StructBlocks (Brady Moe)
- * Fix: All templates with wagtailsettings and modeladmin now use ``block.super`` for ``extra_js`` & ``extra_css`` (Timothy Bautista)
+ * Fix: All templates with wagtailsettings and modeladmin now use `block.super` for `extra_js` & `extra_css` (Timothy Bautista)
 
 2.7 LTS (06.11.2019)
 ~~~~~~~~~~~~~~~~~~~~

docs/releases/2.8.rst

@@ -21,6 +21,7 @@ Other features
  * Added ``get_document_model_string`` function (Andrey Smirnov)
  * Added support for Cloudflare API tokens for frontend cache invalidation (Tom Usher)
  * Added ``ancestors`` field to pages endpoint in admin API (Karl Hobley)
+ * Removed Django admin management of ``Page`` & ``Site`` models (Andreas Bernacca)
 
 
 Bug fixes
@@ -45,6 +46,23 @@ Django 2.0 is no longer supported as of this release; please upgrade to Django 2
 
 
 ``wagtail.documents.models.get_document_model`` has moved
-~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
 The ``get_document_model`` function should now be imported from ``wagtail.documents`` rather than ``wagtail.documents.models``. See :ref:`custom_document_model`.
+
+
+Removed ``Page`` and ``Site`` models from Django admin 
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Django admin will no longer provide editing access to ``Page`` or ``Site`` models, if required these models can be registered within individual projects using `Django's ModelAdmin <https://docs.djangoproject.com/en/2.2/ref/contrib/admin/#modeladmin-objects>`_.
+
+
+.. code-block:: python
+
+    # my_app/admin.py
+    from django.contrib import admin
+
+    from wagtail.core.models import Page, Site
+
+    admin.site.register(Site)
+    admin.site.register(Page)

wagtail/core/admin.py

@@ -1,25 +0,0 @@
-from django.contrib import admin
-from django.contrib.auth.admin import GroupAdmin
-from django.contrib.auth.models import Group
-
-from wagtail.core.models import GroupPagePermission, Page, Site
-
-admin.site.register(Site)
-admin.site.register(Page)
-
-
-# Extend GroupAdmin to include page permissions as an inline
-class GroupPagePermissionInline(admin.TabularInline):
-    model = GroupPagePermission
-    raw_id_fields = ['page']
-    verbose_name = 'page permission'
-    verbose_name_plural = 'page permissions'
-
-
-class GroupAdminWithPagePermissions(GroupAdmin):
-    inlines = GroupAdmin.inlines + [GroupPagePermissionInline]
-
-
-if admin.site.is_registered(Group):
-    admin.site.unregister(Group)
-admin.site.register(Group, GroupAdminWithPagePermissions)