[Zope] Re: upgrading from Zope2.5 to Zope2.6 - ZClasses broken?

[Anthony Baxter]

I also tried exporting one of the broken ZClass products from a 2.5 Zope 
and importing it into 2.6. I get the following traceback:

For the URL http://devhost1:8180/Control_Panel/Products/manage_importObject

 No error message.
 Error type:  ImportError
 Error value: No module named iclass

 <p>Traceback (innermost last):
<ul>

<li>  Module ZPublisher.Publish, line 98, in publish</li>

<li>  Module ZPublisher.mapply, line 88, in mapply</li>

<li>  Module ZPublisher.Publish, line 39, in call_object</li>

<li>  Module OFS.ObjectManager, line 535, in manage_importObject</li>

<li>  Module OFS.ObjectManager, line 551, in _importObjectFromFile</li>

<li>  Module ZODB.ExportImport, line 79, in importFile</li>

<li>  Module ZODB.Transaction, line 236, in commit</li>

<li>  Module ZODB.Transaction, line 351, in _commit_objects</li>

<li>  Module ZODB.Connection, line 302, in commit</li>

<li>  Module ZODB.ExportImport, line 147, in _importDuringCommit</li>

</ul>ImportError: No module named iclass
</p>

Looking in an XML export of one of the broken products, the offending 
line is
<global id="1067586.19" name="Interface" module="Interface.iclass"/>

There's a lib/python/Interface/iclass.py in 2.5, but it's missing in my 2.6
checkout... Is some module aliasing needed here? I added a simple 
lib/python/Interface/iclass.py that just contained 
from _Interface import Interface, but attempts to import now fail with

    No error message.
     Error type:  UnpicklingError
     Error value: <Interface Interface._Interface.Interface at 53cc18> is not safe for unpickling

So that's not a simple workaround. Dammit.

(I can make a copy of one of the broken ZClass-based products available
if someone wants to have a look at making this work... let me know...)

Anthony