Wagtail version change from 2.15.5 to 4.1(LTS)

[thiman samarasinghe]

HI All,

I tried to upgrade wagtail version to 4.1 for my old code.

Unfortunately I got these errors.

I had used BaseFormEditHandler class but I can not find out in version 4.1

Cannot find reference 'BaseFormEditHandler' in 'edit_handlers.py' 

Can somebody help me ?

Thank and Regard

[Matthew Westcott]

Hi,
Edit handlers were completely rewritten in Wagtail 3.0 - see https://docs.wagtail.org/en/stable/releases/3.0.html#api-changes-to-panels-edithandlers. The changes you need to make will depend on exactly what customisations you made originally - it's hard to give any specific advice, as BaseFormEditHandler was an internal class that wasn't intended to be used directly in end-user code.

Cheers,
- Matt

[thiman samarasinghe]

 I need to replace this code .

def get_edit_handler(
  model: ModelBase, model_admin: Optional[ModelAdmin] = None
  ) -> BaseFormEditHandler:

[Matthew Westcott]

If you're only using BaseFormEditHandler as a type annotation, you can probably replace that with Panel (from wagtail.admin.panels import Panel) since all things that previously inherited from BaseFormEditHandler are panels.

- Matt

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