Wagtail 4.0 release notes - IN DEVELOPMENT

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What's new

Image renditions can now be prefetched by filter

When using a queryset to render a list of images, you can now use the prefetch_renditions() queryset method to prefetch the renditions needed for rendering with a single extra query, similar to prefetch_related. If you have many renditions per image, you can also call it with filters as arguments - prefetch_renditions("fill-700x586", "min-600x400") - to fetch only the renditions you intend on using for a smaller query. For long lists of images, this can provide a significant boost to performance. See for more examples. This feature was developed by Tidiane Dia and Karl Hobley.

Other features

Add clarity to confirmation when being asked to convert an external link to an internal one (Thijs Kramer)
Convert various pages in the documentation to Markdown (Khanh Hoang, Vu Pham, Daniel Kirkham, LB (Ben) Johnston, Thiago Costa de Souza, Benedict Faw)
Add base_url_path to ModelAdmin so that the default URL structure of app_label/model_name can be overridden (Vu Pham, Khanh Hoang)
Add full_url to the API output of ImageRenditionField (Paarth Agarwal)
Use InlinePanel's label when available for field comparison label (Sandil Ranasinghe)
Drop support for Safari 13 by removing left/right positioning in favour of CSS logical properties (Thibaud Colas)
Use FormData instead of jQuery's form.serialize when editing documents or images just added so that additional fields can be better supported (Stefan Hammer)
Add informational Codecov status checks for GitHub CI pipelines (Tom Hu)
Make it possible to reuse and customise Wagtail’s fonts with CSS variables (LB (Ben) Johnston)
Add better handling and informative developer errors for cross linking URLS (e.g. success after add) in generic views wagtail.admin.views.generic (Matt Westcott)
Introduce wagtail.admin.widgets.chooser.BaseChooser to make it easier to build custom chooser inputs (Matt Westcott)
Introduce JavaScript chooser module, including a SearchController class which encapsulates the standard pattern of re-rendering the results panel in response to search queries and pagination (Matt Westcott)
Add ability to select multiple items at once within bulk actions selections when holding shift on subsequent clicks (Hitansh Shah)
Upgrade notification, shown to admins on the dashboard if Wagtail is out of date, will now link to the release notes for the closest minor branch instead of the latest patch (Tibor Leupold)
Upgrade notification can now be configured to only show updates when there is a new LTS available via WAGTAIL_ENABLE_UPDATE_CHECK = 'lts' (Tibor Leupold)
Implement redesign of the Workflow Status dialog, fixing accessibility issues (Steven Steinwand)
Add the ability to change the number of images displayed per page in the image library (Tidiane Dia, with sponsorship from YouGov)
Allow users to sort by different fields in the image library (Tidiane Dia, with sponsorship from YouGov)
Add prefetch_renditions method to ImageQueryset for performance optimisation on image listings (Tidiane Dia, Karl Hobley)
Add ability to define a custom get_field_clean_name method when defining FormField models that extend AbstractFormField (LB (Ben) Johnston)
Migrate Home (Dashboard) view to use generic Wagtail class based view (LB (Ben) Johnston)
Combine most of Wagtail’s stylesheets into the global core.css file (Thibaud Colas)
Add new Breadcrumbs and Tabs to the Wagtail pattern library (Paarth Agarwal)
Adopt new Page Editor UI tabs in the workflow history report page (Paarth Agarwal)
Update ReportView to extend from generic wagtail.admin.views.generic.models.IndexView (Sage Abdullah)
Introduce a wagtail.admin.viewsets.chooser.ChooserViewSet module to serve as a common base implementation for chooser modals (Matt Westcott)
Add documentation for wagtail.admin.viewsets.model.ModelViewSet (Matt Westcott)
Enhance new Breadcrumbs so they can be added to any header or container element and adopt on the page explorer (listing) view (Paarth Agarwal)
Added multi-site support to the API (Sævar Öfjörð Magnússon)

Bug fixes

Fix issue where ModelAdmin index listings with export list enabled would show buttons with an incorrect layout (Josh Woodcock)
Fix typo in ResumeWorkflowActionFormatter message (Stefan Hammer)
Throw a meaningful error when saving an image to an unrecognised image format (Christian Franke)
Remove extra padding for headers with breadcrumbs on mobile viewport (Steven Steinwand)
Replace PageRevision with generic Revision model (Sage Abdullah)
Ensure that custom document or image models support custom tag models (Matt Westcott)
Ensure comments use translated values for their placeholder text (Stefan Hammer)
Ensure the upgrade notification, shown to admins on the dashboard if Wagtail is out of date, content is translatable (LB (Ben) Johnston)
Only show the re-ordering option to users that have permission to publish pages within the page listing (Stefan Hammer)
Ensure default sidebar branding (bird logo) is not cropped in RTL mode (Steven Steinwand)
Add an accessible label to the image focal point input when editing images (Lucie Le Frapper)
Remove unused header search JavaScript on the redirects import page (LB (Ben) Johnston)
Ensure non-square avatar images will correctly show throughout the admin (LB (Ben) Johnston)
Ignore translations in test files and re-include some translations that were accidentally ignored (Stefan Hammer)
Show alternative message when no page types are available to be created (Jaspreet Singh)
Prevent error on sending notifications for the legacy moderation process when no user was specified (Yves Serrano)

Upgrade considerations

`base_url_path` keyword argument added to AdminURLHelper

The wagtail.contrib.modeladmin.helpers.AdminURLHelper class now accepts a base_url_path keyword argument on its constructor. Custom subclasses of this class should be updated to accept this keyword argument.

Dropped support for Safari 13

Safari 13 will no longer be officially supported as of this release, this deviates the current support for the last 3 version of Safari by a few months and was required to add better support for RTL languages.

`PageRevision` replaced with `Revision`

The PageRevision model has been replaced with a generic Revision model. If you use the PageRevision model in your code, make sure that:

Creation of PageRevision objects should be updated to create Revision objects using the page's id as the object_id, the default Page model's content type as the base_content_type, and the page's specific content type as the content_type.
Queries that use the PageRevision.objects manager should be updated to use the Revision.page_revisions manager.
Revision queries that use Page.id should be updated to cast the Page.id to a string before using it in the query (e.g. by using str() or Cast("page_id", output_field=CharField())).
Page queries that use PageRevision.page_id should be updated to cast the Revision.object_id to an integer before using it in the query (e.g. by using int() or Cast("object_id", output_field=IntegerField())).
Access to PageRevision.page should be updated to Revision.content_object.

If you maintain a package across multiple Wagtail versions that includes a model with a ForeignKey to the PageRevision model, you can create a helper function to correctly resolve the model depending on the installed Wagtail version, for example:

from django.db import models
from wagtail import VERSION as WAGTAIL_VERSION


def get_revision_model():
    if WAGTAIL_VERSION >= (4, 0):
        return "wagtailcore.Revision"
    return "wagtailcore.PageRevision"


class MyModel(models.Model):
    # Before
    # revision = models.ForeignKey("wagtailcore.PageRevision")
    revision = models.ForeignKey(get_revision_model(), on_delete=models.CASCADE)

`AdminChooser` replaced with `BaseChooser`

Custom choosers should no longer use wagtail.admin.widgets.chooser.AdminChooser which has been replaced with wagtail.admin.widgets.chooser.BaseChooser.

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