session.auto and objects that cannot be pickled leads to headache

Hi,

I just finished tracking down a very annoying bug.  It turned out that
I had changed one of my objects to use an instancemethod  (e.g.

class O:
  def __init__(self):
    bar = foo

  def foo(self):
    # do something
    pass

which when you try to pickle an object of this type you get an error
complaining about the instancemethod.  However, from what I can tell
if o is an object of type O then doing:

session.auto['blah'] = o

does not give any exception, but in fact resets auto to None.  I think
we should change this so that the developer has a better idea of whats
going on.  We should probabally bubble up the same error message that
pickle gives.

Thoughts,
Jon.


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