Stephen Masterman wrote at 2005-5-17 15:55 -0400: > ... >Does ZODB have something equivalent to Durus' Computed Attributes? Which >I understand are attributes (or methods) on a Persistent object that >compute a value from some other attributes and then cache that result >for each connection, and if any of the attributes from which the >Computed Attribute computes its result change, the new result will be >automatically computed and all connections will have their cached value >invalidated.
Oneone else already pointed out "ComputedAttribute". It does neither automatic caching nor is there any support for modification notifications. > ... "__getattr__" >and I know the ZODB docs warn against messing >with those functions for Persistent classes. "__getattr__" is still very dangerous -- especially when it handles acquisition wrapped objects. But Jim removed the explicit problem related to persistent objects a long time ago. Only the general dangers for "__getattr__" remain. -- Dieter _______________________________________________ For more information about ZODB, see the ZODB Wiki: http://www.zope.org/Wikis/ZODB/ ZODB-Dev mailing list - ZODB-Dev@zope.org http://mail.zope.org/mailman/listinfo/zodb-dev
