AttributeError: 'ZODBReference' object has no attribute '__bases__'

[1letter]

my zodbupdate raise the follwoing error:

Traceback (most recent call last):
  File "/Development/Plone/coredev52multipy/py3/eggs/zope.interface-4.6.0-py3.7-linux-x86_64.egg/zope/interface/declarations.py", line 269, in implementedByFallback
    bases = cls.__bases__
AttributeError: 'ZODBReference' object has no attribute '__bases__'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/Development/Plone/coredev52multipy/py3/eggs/zodbupdate-1.2-py3.7.egg/zodbupdate/main.py", line 214, in main
    updater()
  File "/Development/Plone/coredev52multipy/py3/eggs/zodbupdate-1.2-py3.7.egg/zodbupdate/update.py", line 82, in __call__
    new = self.processor.rename(current)
  File "/Development/Plone/coredev52multipy/py3/eggs/zodbupdate-1.2-py3.7.egg/zodbupdate/serialize.py", line 333, in rename
    data = unpickler.load()
  File "/Development/Plone/coredev52multipy/py3/eggs/zope.interface-4.6.0-py3.7-linux-x86_64.egg/zope/interface/declarations.py", line 272, in implementedByFallback
    raise TypeError("ImplementedBy called for non-factory", cls)
TypeError: ('ImplementedBy called for non-factory', <zodbupdate.serialize.ZODBReference object at 0x7fe45a0fb5c0>)
Stopped processing, due to: ('ImplementedBy called for non-factory', <zodbupdate.serialize.ZODBReference object at 0x7fe45a0fb5c0>)
Traceback (most recent call last):
  File "/Development/Plone/coredev52multipy/py3/eggs/zope.interface-4.6.0-py3.7-linux-x86_64.egg/zope/interface/declarations.py", line 269, in implementedByFallback
    bases = cls.__bases__
AttributeError: 'ZODBReference' object has no attribute '__bases__'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/Development/Plone/coredev52multipy/py3/eggs/zodbupdate-1.2-py3.7.egg/zodbupdate/main.py", line 214, in main
    updater()
  File "/Development/Plone/coredev52multipy/py3/eggs/zodbupdate-1.2-py3.7.egg/zodbupdate/update.py", line 82, in __call__
    new = self.processor.rename(current)
  File "/Development/Plone/coredev52multipy/py3/eggs/zodbupdate-1.2-py3.7.egg/zodbupdate/serialize.py", line 333, in rename
    data = unpickler.load()
  File "/Development/Plone/coredev52multipy/py3/eggs/zope.interface-4.6.0-py3.7-linux-x86_64.egg/zope/interface/declarations.py", line 272, in implementedByFallback
    raise TypeError("ImplementedBy called for non-factory", cls)
TypeError: ('ImplementedBy called for non-factory', <zodbupdate.serialize.ZODBReference object at 0x7fe45a0fb5c0>)

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "./py3/bin/zodbupdate", line 265, in <module>
    sys.exit(zodbupdate.main.main())
  File "/Development/Plone/coredev52multipy/py3/eggs/zodbupdate-1.2-py3.7.egg/zodbupdate/main.py", line 218, in main
    raise AssertionError()
AssertionError

Any hints?

[ale-rt]

@1letter did you solved this.
I think I have a solution (adding an empty call to the ZODBReference class).
In my case the object that was causing the error was the acl_users folder.
I got this by inserting a pdb in a try/except around self.processor.rename(current).

In the scope of that function you can get the oid of the object:

(Pdb) ZODB.utils.oid_repr(oid)
'0x01ab'

Then on Py2 you can get info about that object:

[ale@emily zeo]$ ./bin/zopepy src/ZODB/src/ZODB/scripts/fsoids.py Data.fs 0x01ab|grep 0x01ab
oid 0x01ab Products.PluggableAuthService.PluggableAuthService.PluggableAuthService 1 revision
        referenced by 0x01ab Products.PluggableAuthService.PluggableAuthService.PluggableAuthService at 157083378
        references 0x01ab Products.PluggableAuthService.PluggableAuthService.PluggableAuthService at 157083378

I will try to submit a patch.

[1letter]

I can't remember that anymore. Upps. But if i see the timestamp, then the site it was an ugly old site with an old ldap /usercreation pas plugin. Sorry.

[ale-rt]

Thanks anyway!