Swappable Site model

[lb-]

Is your proposal related to a problem?

This issue has been created out of an abandoned PR to achieve this goal #5457

Django has undocumented support for swappable models,
most commonly used when specifying a custom auth.User model.

Describe the solution you'd like

Potentially using A relatively simple third party library provides an
API for leveraging this feature.

Wagtail core would provide an abstract version of the existing Site model
(with default attributes, methods, object manager, queryset etc), and helper methods to retrieve the
correct site model, falling back to a default.

Describe alternatives you've considered

Leave as is, the swappable feature is intentionally undocumented in Django and may be risky to adopt.

Additional context

• Previous PR that worked through implementing this but is unable to be continued - [WIP] Swappable site #5457
• Issue about custom image/document swappable models - Custom Image and Documents Models should use Django Swappable Models #10331
• May enable more multi-site features such as Site specific Locales #7843 & Segregated multi-site support #7521
• Relates to an open RFC for swappable Page model RFC 53: Swappable Page model rfcs#53

Working on this

• This will require extensive knowledge of how Django models and migrations work, including undocumented model features in Django.
• Anyone is free to pick up the PR that was created [WIP] Swappable site #5457 & work through the issues/feedback & rebase as a new PR.
• View our contributing guidelines, add a comment to the issue once you’re ready to start.

[nandini584]

I would like to give this a try, Could you let me know, how shall I proceed with it? @lb-

[lb-]

@nandini584 this will require extensive knowledge of how Django models and migrations work, including undocumented model features in Django.

If you are keen, please read through the previous PR and feedback on there. However, I might recommend you take look at some other issues instead.

[nandini584]

Ohkk sure, i will go for some other issues, thanks.

[salty-ivy]

would like to investigate this one may be not from the PR point of view unless I am sure about the issue and the previous PR, seems really interesting from django adaptation point of view.