[Zope-CMF] Re: Delete trouble

[Philipp von Weitershausen]

Martin Aspeli wrote:
Traceback (innermost last):
  Module ZPublisher.Publish, line 119, in publish
  Module ZPublisher.mapply, line 88, in mapply
  Module ZPublisher.Publish, line 42, in call_object
  Module OFS.ObjectManager, line 524, in manage_delObjects
  Module OFS.ObjectManager, line 379, in _delObject
  Module zope.event, line 23, in notify
  Module zope.component.event, line 26, in dispatch
  Module zope.component._api, line 130, in subscribers
  Module zope.component.registry, line 290, in subscribers
  Module zope.interface.adapter, line 535, in subscribers
  Module zope.component.event, line 33, in objectEventNotify
  Module zope.component._api, line 130, in subscribers
  Module zope.component.registry, line 290, in subscribers
  Module zope.interface.adapter, line 535, in subscribers
  Module OFS.subscribers, line 108, in dispatchObjectWillBeMovedEvent
  Module zope.app.container.contained, line 182, in dispatchToSublocations
  Module zope.component._api, line 130, in subscribers
  Module zope.component.registry, line 290, in subscribers
  Module zope.interface.adapter, line 535, in subscribers
  Module OFS.subscribers, line 108, in dispatchObjectWillBeMovedEvent
  Module zope.app.container.contained, line 182, in dispatchToSublocations
  Module zope.component._api, line 130, in subscribers
  Module zope.component.registry, line 290, in subscribers
  Module zope.interface.adapter, line 535, in subscribers
  Module Products.CMFCore.CMFCatalogAware, line 285, in 
dispatchToOpaqueItems
  Module zope.component._api, line 130, in subscribers
  Module zope.component.registry, line 290, in subscribers
  Module zope.interface.adapter, line 535, in subscribers
  Module Products.CMFCore.CMFCatalogAware, line 306, in 
handleOpaqueItemEvent
  Module Products.CMFUid.UniqueIdAnnotationTool, line 87, in 
manage_beforeDelete
  Module zope.component._api, line 207, in getUtility
ComponentLookupError: (<InterfaceClass 
Products.CMFUid.interfaces.IUniqueIdAnnotationManagement>, '')

The UniqueIDAnnotationTool should probably do a *query*Utility (which 
will return None in case the utility can't be found) and simply not do 
anything in such a case. The canonical way of expressing such fail-safe 
routines is therefore:

  component = query{Utility|Adapter|MultiAdapter}(...)
  if component is not None:
      ...


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