I'm having trouble with the instrumented lists used for relation
collections:
def setProp(self, new_prop, exclusive=True):
self.props = [p for p if p.typ != new_prop.typ]
self.props.append(new_prop)
so if 'props' is a relation on some mapped class, and I try C.setProp(newprop),
then a later flush() fails when it tries to write a null FK in the
properties table.
I suspect it's the list comprehension when there's items in there that
haven't been flushed yet.
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