[Zope-ZEO] ZEO interferes with the ZODB object history mechanism

[Ken Manheimer]

This is a bug report, in lieu of using the collector, which probably
shouldn't get zeo bugs yet...

When visiting the history tab for an object while running under ZEO,
clicking on the links for all but the object's current version raises
the following traceback.  This doesn't happen for the same objects in
the same site, but without ZEO in the picture.

Zope Error
Zope has encountered an error while publishing this resource. 

NameError

Sorry, a Zope error occurred.

Traceback (innermost last):
  File /usr/local/dc/ZapMedia/Zope2.2b/lib/python/ZPublisher/Publish.py, line 222, in publish_module
  File /usr/local/dc/ZapMedia/Zope2.2b/lib/python/ZPublisher/Publish.py, line 187, in publish
  File /usr/local/dc/ZapMedia/Zope2.2b/lib/python/Zope/__init__.py, line 221, in zpublisher_exception_hook
  File /usr/local/dc/ZapMedia/Zope2.2b/lib/python/ZPublisher/Publish.py, line 162, in publish
  File /usr/local/dc/ZapMedia/Zope2.2b/lib/python/ZPublisher/BaseRequest.py, line 350, in traverse
  File /usr/local/dc/ZapMedia/Zope2.2b/lib/python/OFS/History.py, line 138, in __getitem__
    (Object: CommunityContentDesigns)
  File /usr/local/dc/ZapMedia/Zope2.2b/lib/python/OFS/History.py, line 118, in historicalRevision
    (Object: CommunityContentDesigns)
  File /usr/local/dc/ZapMedia/Zope2.2b/lib/python/ZODB/Connection.py, line 459, in oldstate
  File /usr/local/dc/ZapMedia/Zope2.2b/lib/python/ZODB/BaseStorage.py, line 222, in loadSerial
    (Object: ZEO Demo)
NameError: POSException


Ken Manheimer
klm@digicool.com