Dexterity edit form hook for accesing old and new state of a content object

Plone Support Add-on Development
1

Is there some hook/away in Dexterity for capturing changes done through the edit form?
In particular I need to get hold of the old and the new state of a content object.

-aj

2

if you are using standard plone add/edit forms based on z3c.form, you can subscribe to the DataExtractedEvent z3c.form.events.DataExtractedEvent, which was added in 3.2.1. This one is fired after data and errors are extracted from widgets. not sure, how to get the object itself, which you want to compare your old values against...

3

Afaik the zope.lifecycleevent.ObjectModifiedEvent is fired as usal. And in theory this event should have descriptions on, which are telling what was modified.

4

'descriptions' is it.

-aj

5

'descriptions' is it.