[Zope-CMF] workflow and deletes

[Jens Vagelpohl]

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On 14 Feb 2007, at 15:10, Miles wrote:
> I was wondering how - if at all - others have made a workflow react  
> to deletion of an object.  Is there any call for some hook/event  
> that allows workflows to respond to this event?  It seems a bit odd  
> to me that workflows are carefully notified of creation via  
> notifyCreated, but can't do anything about deletions.

The standard workflows shipping with CMF simply never cared, no one  
had the need. I believe the same is true for the standard Plone  
workflows.


> I thought of creating a 'delete' workflow action, but that would  
> cause problems if ever the object were deleted via a different  
> mechanism (e.g. zmi).

For older CMF versions you'd normally define your own  
manage_beforeDelete to do whatever you want it to do just before the  
onject is deleted.

In CMF-trunk, the future CMF 2.1, this has been changed to use events  
instead. Take a look at CMFCore/events.zcml for how to register an  
event handler and CMFCore/CMFCatalogAware.py to see some handlers.  
Obviously this is a much better solution since you don't need to  
change existing code, you just need to write a handler function and  
register it using zcml.

jens

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