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

[Max M]

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

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