Inlines trigger error upon save

[jkoestinger]

Hi, first thank you for the work on this project

I tried to implement the base example for the form builder (provided there: https://docs.wagtail.io/en/latest/reference/contrib/forms/#usage) and I ran into the following issue:

• The FormField is not translatable, so it does not show in the translated page, that's expected
• If I add the TranslatableMixin to the FormField, I get the following error when saving the original page:
  

Is there something that I missed? Also, I'm not 100% sure whether it concerns this project or the Wagtail project directly

[kaedroho]

Hi @jkoestinger

If you're adding TranslatableMixin to a model with existing data Django will try to assign the same UUID to every value in the model causing an error like this.

The way to solve this is to use the BootstrapTranslatableMixin method described in https://docs.wagtail.io/en/stable/advanced_topics/i18n.html#making-snippets-with-existing-data-translatable

The title "Making snippets with existing data translatable" is a little misleading as it applies to child objects too, I'll fix that!

[jkoestinger]

Hi, thanks for your response.

Sorry, my initial message was unclear: I actually removed the model (by unapplying the migration and deleting it) directly before adding the mixin, so I think the BootstrapTranslatableMixin step should not be needed in this case, right?

[kaedroho]

Yep, that's correct. I've just managed to replicate this locally and can confirm it's a bug, thanks for reporting!