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Wagtail 2.9 release notes - IN DEVELOPMENT
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What's new
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Report data exports
~~~~~~~~~~~~~~~~~~~

Data from reports, form submissions and ModelAdmin can now be exported to both XLSX and CSV format. For ModelAdmin, this is enabled by specifying a ``list_export`` attribute on the ModelAdmin class. This feature was developed by Jacob Topp-Mugglestone and sponsored by `The Motley Fool <https://www.fool.com/>`_.


Other features
~~~~~~~~~~~~~~

 * Added support for creating custom reports (Jacob Topp-Mugglestone)
 * Skip page validation when unpublishing a page (Samir Shah)
 * Added :ref:`streamfield_multiplechoiceblock` block type for StreamField (James O'Toole)
 * ChoiceBlock now accepts a ``widget`` keyword argument (James O'Toole)
 * Reduced contrast of rich text toolbar (Jack Paine)
 * Support the rel attribute on custom ModelAdmin buttons (Andy Chosak)
 * Server-side page slug generation now respects ``WAGTAIL_ALLOW_UNICODE_SLUGS`` (Arkadiusz Michał Ryś)
 * Wagtail admin no longer depends on SiteMiddleware, avoiding incompatibility with Django sites framework and redundant database queries (aritas1, timmysmalls, Matt Westcott)
 * Tag field autocompletion now handles custom tag models (Matt Westcott)
 * ``wagtail_serve`` URL route can now be omitted for headless sites (Storm Heg)
 * Allow free tagging to be disabled on custom tag models (Matt Westcott)
 * Allow disabling page preview by setting ``preview_modes`` to an empty list (Casper Timmers)
 * Add Vidyard to oEmbed provider list (Steve Lyall)
 * Optimise compiling media definitions for complex StreamBlocks (pimarc)
 * FieldPanel now accepts a 'heading' argument (Jacob Topp-Mugglestone)
 * Replaced deprecated ``ugettext`` / ``ungettext`` calls with ``gettext`` / ``ngettext`` (Mohamed Feddad)
 * ListBLocks now call child block ``bulk_to_python`` if defined (Andy Chosak)
 * Site settings are now identifiable/cachable by request as well as site (Andy Babic)
 * Added ``select_related`` attribute to site settings to enable more efficient fetching of foreign key values (Andy Babic)
 * Add caching of image renditions (Tom Dyson, Tim Kamanin)


Bug fixes
~~~~~~~~~

 * Added ARIA alert role to live search forms in the admin (Casper Timmers)
 * Reordered login form elements to match expected tab order (Kjartan Sverrisson)
 * Re-added 'Close Explorer' button on mobile viewports (Sævar Öfjörð Magnússon)
 * Added a more descriptive label to Password reset link for screen reader users (Casper Timmers, Martin Coote)
 * Improved Wagtail logo contrast by adding a background (Brian Edelman, Simon Evans, Ben Enright)
 * Prevent duplicate notification messages on page locking (Jacob Topp-Mugglestone)
 * Rendering of non field errors for InlinePanel items (Storm Heg)
 * ``{% image ... as var %}`` now clears the context variable when passed None as an image (Maylon Pedroso)
 * ``refresh_index`` method on Elasticsearch no longer fails (Lars van de Kerkhof)
 * Document tags no longer fail to update when replacing the document file at the same time (Matt Westcott)
 * Prevent error from very tall / wide images being resized to 0 pixels (Fidel Ramos)
 * Remove excess margin when editing snippets (Quadric)
 * Added ``scope`` attribute to table headers in TableBlock output (Quadric)
 * Prevent KeyError when accessing a StreamField on a deferred queryset (Paulo Alvarado)
 * Hide empty 'view live' links (Karran Besen)
 * Mark up a few strings for translation (Luiz Boaretto)
 * Invalid focal_point attribute on image edit view (Michał (Quadric) Sieradzki)
 * No longer expose the ``.delete()`` method on the default Page.objects manager (Nick Smith)
 * ``exclude_fields_in_copy`` on Page models will now work for for modelcluster parental / many to many relations (LB (Ben Johnston))


Upgrade considerations
======================

Removed support for Django 2.1
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Django 2.1 is no longer supported as of this release; please upgrade to Django 2.2 or above before upgrading Wagtail.


``SiteMiddleware`` and ``request.site`` deprecated
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Wagtail's :class:`~wagtail.core.middleware.SiteMiddleware`, which makes the current site object available as the property ``request.site``, is now deprecated as it clashes with Django's sites framework and makes unnecessary database queries on non-Wagtail views. References to ``request.site`` in your code should be removed; the recommended way of retrieving the current site is ``Site.find_for_request(request)`` in Python code, and the ``{% wagtail_site %}`` tag within Django templates. Once these are removed, ``'wagtail.core.middleware.SiteMiddleware'`` can be removed from your project's ``MIDDLEWARE`` setting.


Page / Collection managers no longer expose a ``delete`` method
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

For `consistency with standard Django models <https://docs.djangoproject.com/en/stable/topics/db/queries/#deleting-objects>`_, the ``delete()`` method is no longer available on the default Page and Collection managers. Code such as ``Page.objects.delete()`` should be changed to ``Page.objects.all().delete()``.