UnpickleableError: Cannot pickle
Now you can search al your code and guess where you set that property.
That can be solved much simpler:
modify ZODB/serialize.py temporarly as follows:
def _dump(self, classmeta, state):
# To reuse the existing cStringIO object, we must reset
# the file position to 0 and truncate the file after the
# new pickle is written.
self._file.seek(0)
self._p.clear_memo()
self._p.dump(classmeta)
try:
self._p.dump(state)
except:
#your favorite debugger's break command
self._file.truncate()
return self._file.getvalue()
And voila, classmeta is the class concerned, state is a dict holding the state. From these values it's piece of cake.
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