[plone.app.versioningbehavior] AttributeError: 'Removed' object has no attribute 'object'

1

We have this (historic) code for flushing the version history of content type objects:

        context = self.context

        purgepolicy = getToolByName(context, "portal_purgepolicy")
        repository = getToolByName(context, "portal_repository")

        old_keep = purgepolicy.maxNumberOfVersionsToKeep
        purgepolicy.maxNumberOfVersionsToKeep = 1

        if repository.isVersionable(context):
            try:
                obj, history_id = dereference(context)
                purgepolicy.beforeSaveHook(history_id, obj)
                if hasattr(obj.aq_inner.aq_base, "version_id"):
                    del obj.version_id
                self.messages = [("info", _(u"History is cleared."))]
            except Exception as e:
                self.messages = [("error", _(u"Something went wrong.") + " ({})".format(e))]
                logger.error("Error clearing version history of {}".format(context.absolute_url()), exc_info=True)

        purgepolicy.maxNumberOfVersionsToKeep = old_keep

which leads to the error below using "Edit" after previously clearing the history

Traceback (innermost last):
  Module ZPublisher.WSGIPublisher, line 156, in transaction_pubevents
  Module ZPublisher.WSGIPublisher, line 338, in publish_module
  Module ZPublisher.WSGIPublisher, line 256, in publish
  Module ZPublisher.mapply, line 85, in mapply
  Module ZPublisher.WSGIPublisher, line 62, in call_object
  Module plone.z3cform.layout, line 63, in __call__
  Module plone.z3cform.layout, line 47, in update
  Module plone.dexterity.browser.edit, line 58, in update
  Module plone.z3cform.fieldsets.extensible, line 65, in update
  Module plone.z3cform.patch, line 30, in GroupForm_update
  Module z3c.form.group, line 145, in update
  Module plone.app.z3cform.csrf, line 22, in execute
  Module z3c.form.action, line 98, in execute
  Module z3c.form.button, line 315, in __call__
  Module z3c.form.button, line 170, in __call__
  Module plone.dexterity.browser.edit, line 30, in handleApply
  Module z3c.form.group, line 126, in applyChanges
  Module zope.event, line 32, in notify
  Module zope.component.event, line 27, in dispatch
  Module zope.component._api, line 124, in subscribers
  Module zope.interface.registry, line 442, in subscribers
  Module zope.interface.adapter, line 607, in subscribers
  Module zope.component.event, line 36, in objectEventNotify
  Module zope.component._api, line 124, in subscribers
  Module zope.interface.registry, line 442, in subscribers
  Module zope.interface.adapter, line 607, in subscribers
  Module plone.app.versioningbehavior.subscribers, line 62, in create_version_on_save
  Module Products.CMFEditions.CopyModifyMergeRepositoryTool, line 336, in save
  Module Products.CMFEditions.CopyModifyMergeRepositoryTool, line 500, in _recursiveSave
  Module Products.CMFEditions.ArchivistTool, line 267, in prepare
  Module Products.CMFEditions.ModifierRegistryTool, line 135, in getReferencedAttributes
  Module plone.app.versioningbehavior.modifiers, line 116, in getReferencedAttributes
  Module Products.CMFEditions.CopyModifyMergeRepositoryTool, line 410, in retrieve
  Module Products.CMFEditions.CopyModifyMergeRepositoryTool, line 563, in _retrieve
  Module Products.CMFEditions.CopyModifyMergeRepositoryTool, line 635, in _recursiveRetrieve
  Module Products.CMFEditions.ArchivistTool, line 342, in retrieve
  Module Products.CMFEditions.ArchivistTool, line 501, in __getitem__
AttributeError: 'Removed' object has no attribute 'object'

Any idea?

2

I just hit the the same issue.
Did you find a solution for this?

3

I just came across this in a Plone 6 site. It looks like a simple way to get around this is to add a try/except block in CMFEditions/ArchivistTool/ArchivistTool.isUpToDate. USE AT YOUR OWN RISK

def isUpToDate(self, obj=None, history_id=None, selector=None, countPurged=True):
        """See IPurgeSupport."""
        storage = getToolByName(self, "portal_historiesstorage")
        obj, history_id = dereference(obj, history_id, self)
        if not storage.isRegistered(history_id):
            raise ArchivistUnregisteredError("The object %r is not registered" % obj)

        try:
            modified = storage.getModificationDate(history_id, selector, countPurged)
        except AttributeError:
            return False
        return modified == obj.modified()

I try to be as minimally invasive as possible. If it can't get the last history mod date it's not up to date.