Re: [Zope-dev] Custom class: cut,copy,rename?

2 Mar 2004

      Ian Beatty wrote:
...
Am I not inheriting from the proper set of base classes? Is there an 
easier
way? According to the ZDG (2.4 edition, vs. my Zope 2.7),
OFS.SimpleItem.Item (subclassed by OFS.SimpleItem.SimpleItem) is 
supposed to
provide cut-and-paste functionality. So, how might I be breaking it?
The order of the parent classes matters. Ie. Some methods are defined in 
SimpleItem that returns None. Clipped from the source::

     # This keeps simple items from acquiring their parents
     # objectValues, etc., when used in simple tree tags.
     def objectValues(self, spec=None):
         return ()
     objectIds=objectItems=objectValues

So if SimpleItem is before ObjectManager the traversal order of the 
parent objects will make shure that you get the wrong methods :-( So 
this will *not* work:

     class aSimpleItem(
          CatalogAware, PropertyManager,
          SimpleItem.SimpleItem, ObjectManager):

This order works:

     class aSimpleItem(
          CatalogAware, PropertyManager, SimpleItem):

     class anObjectManager(
          ObjectManager, aSimpleItem):

regards Max M