RelatedFieldWidgetWrapper links toggling isn’t working for radio widgets

[Thibaud Colas]

Spotted as part of #34622. In the Redirects contrib module, when creating a new redirect, the first field is for a Site instance. This is using a radio button (radio_fields ModelAdmin definition: ​https://github.com/django/django/blob/main/django/contrib/redirects/admin.py#L10). This uses RelatedFieldWidgetWrapper – which doesn’t work for radio widgets. Demo:

If we look at ​RelatedObjectLookups.js, it seems clear this code was only written to support select widgets.

Tagging this contrib.admin because it seems to affect all usage of RelatedFieldWidgetWrapper – but as far as I can see in Django itself only contrib.redirects uses radio_fields.

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In this instance I believe a select widget would be a much nicer experience anyway, so not entirely sure whether it makes sense to change the widget to fix this, or update the code to support radio buttons, or do both.