Test projects needed for removal of Field.get_db_prep_lookup()/get_prep_lookup()

[Tim Graham]

Claude and I have been working on a ticket [0] to remove the Field.get_db_prep_lookup() and Field.get_prep_lookup() methods in favor of moving that functionality to the lookups themselves. It would be helpful if we had some test apps and/or projects that implement these methods so we can determine what level of backwards-compatibility is needed. If you're using those methods in your project, could you see if Claude's latest pull request [1] breaks anything for you?

[0] https://code.djangoproject.com/ticket/22936
[1] https://github.com/django/django/pull/6499

[Adam Johnson]

Just bumped up against this in Django-MySQL, fixing in django-mysql/pull/292. In most cases it's easy to work around, but this usecase is not the most fun - wrapping values for the default lookups on the JSONField: https://github.com/adamchainz/django-mysql/blob/a17645efbb7fa0d6aefd04ee76d3c155e5b0718b/django_mysql/models/fields/json.py#L123 . The way I'm fixing it is by subclassing every built-in lookup to mix-in the same behaviour on each.