Plone: reacting to object removal

Question

I\'m wanting to redirect to a container\'s parent after deleting an item within it. To this end, I\'ve tried subscribing to zope.lifecycleevent\'s IObjectRemovedEvent<

Answer 1

A co-worker came up with a working solution:

import transaction

def redirect_to_trial(trans, obj=None, parent=None):
    if obj.id not in parent:
        request = getattr(obj, 'REQUEST', None)
        if request:
            trial_url = obj.__parent__.__parent__.absolute_url()
            request.response.redirect(trial_url)

@grok.subscribe(ISite, IObjectRemovedEvent)
def on_site_delete(obj, event):
    kwargs = dict(
        obj = obj,
        parent = event.oldParent,
    )
    transaction.get().addAfterCommitHook(redirect_to_trial, kws=kwargs)

This checks after the commit to ensure the object actually has been removed, before performing the redirection.

Some confirmation of whether this is a suitable approach would be appreciated, though.