[Zope] Adding a base class to a Z Class

[douwe@oberon.nl]

>  > ZDerived1, I get unchanged results. Somewhere a copy of the
> old ZBase seems
>  > to lurk around. How can that be?
> Did you restart your Zope?

Yes I did restart Zope, but to no avail.

So I decided to dig a little deeper. I exported my base class and one
depending class in seperate .zexp files. I set up a new zope server, created
a new product and imported the classes. I then deleted all methods from both
classes, except one in the base. I modified this method to only return a
fixed string. I then added a index_html method to the depending class that
would only call the one remaining function in the base class.

I created an instance of the depending class and tried to run index_html,
but it gave an error, in the method of the base class, but alas on a line
that no longer existed. To prove myself a point, I created a new depending
class, directly derived from the base class and added the same index_html.
Instances of this one do work.

Very weird. I then exported the whole thing using xml, just to see if I
could find something. Opening the xml reveiled the complete implementation
of the base class, including all the methods I deleted. The method I left in
the base class turned up twice, once in its new incarnation, once in its old
incarnation. I did pack the database before export.

I have now two simple zclasses which look completely identical, but give
different results. Any clue as to what might go wrong and why deleted code
shows up in an export?

Douwe