mike bayer <mike...@zzzcomputing.com> added the comment:
OK, more specifically, here's the kind of situation where items in a set are
mutable:
company = Session.query(Company).first()
# company.employees is a set()
company.employees
# each employee references the parent company
for e in company.employees:
assert e.company is company
So nothing is mutated relationally in this case. It's just a plain old
bidirectional structure. If two objects are related via many-to-many, then
you might have a set in both directions. I'm not sure if this specific
situation produces the pickle bug, however, it's been awhile since I've seen
which specific case causes the problem. But there are mutable items in a set
in these examples and it doesn't seem unreasonable to me.
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue9269>
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