-----Original Message----- From: Kevin Dangoor [mailto:kid@kendermedia.com] Sent: Wednesday, August 04, 1999 10:27 PM To: zope-dev@zope.org Subject: [Zope-dev] CatalogAware must come before ObjectManager

I don't know if this is a bug, or simply a function of how things work... but it appears that a ZClass must list CatalogAware as a base class before ObjectManager if you wish the CatalogAware functionality to be there. If this is expected behavior, then this should probably be documented...

This is the intended behavior. Both ObjectManager and CatalogAware define a manage_afterAdd method. The CatalogAware class must be subclassed first in order for it's afterAdd to be called instead of ObjectManagers. This is identical behavior to python. You're right, it should be documented.

BTW, will it ever be possible to change the Base classes of a ZClass?

It is possible, but only from python, and it is a *real* hack. Doing this is completely unsupported. I might get shot for revealing the technique. Given a Product called 'YourProduct' that contains a Zclass called 'YourZClass' that you want to 'rebase', first, create a temporary ZClass called 'TempZClass' in the same product. 'TempZClass' should be built with the new order or types of subclasses that you want 'YourZClass' to have. Note that 'TempZClass' need not have anything in it, it just needs to subclass the right classes. Shut down Zope, run python1.5.2 in your lib/python directory, and execute the following code:

...

...

import Zope p = Zope.app().Control_Panel.Products.YourProduct p <Product instance at 849de28> p.YourZClass._setBasesHoldOnToYourButts(p.TempZClass._zbases[1:]) get_transaction().commit()

-Michel

Kevin

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