[Zope] Adding another base class to an existing ZClass

[Chris McDonough]

AFAIK, there is no approved way to add a base class to an existing
ZClass.  I've heard from other people at DC that it is possible, but
it's a "hold on to your butts" experience.  That said, I have no idea
whether Gregor's method will work or not.

Gregor wrote:
> 
> ----- Original Message -----
> From: "Steve Jibson" <stevej@parlant.com>
> To: <zope@zope.org>
> Sent: Friday, January 07, 2000 6:22 PM
> Subject: [Zope] Adding another base class to an existing ZClass
> 
> > I've spent many hours working on a ZClass (with multiple sub-zclasses,
> > etc.), and now I've decided that I should have inherited from Folder as
> > well as ObjectManager when I created the ZClass.  Is there a way to add
> > a base class to the base class list of an existing ZClass, or do I need
> > to start all over?
> 
> Did anyone ever reply to this, or are you still trying to figure it out?
> 
> I've seen something in the Zope how-tos or guides about the "class id" field
> on the "basic" tab of the ZClass, and swapping out one ZClass for another.
> 
> I THINK the basic idea is that you would copy or export everything you want to
> keep (such as child ZClasses and methods) to a safe place, copy the ZClass's
> class id to a file somewhere, then delete the ZClass.
> 
> Create a new one with the same id, deriving from whatever you need.  Then
> replace the new class's id with the one you saved in the file.  Finally,
> re-import or paste the things you needed to keep from the old class.
> 
> I have not tested the above and have no idea if it would work, so I really
> recommend backing your database up before you try it.  If you do try it, let
> me know how it works out.
> 
> - Gregor
> 
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-- 
Chris McDonough
Digital Creations, Inc.
Zope - http://www.zope.org