editing the cascade isn't an option.
for now this seems to work, though it's ugly.
def recursive_expunge(obj, dbSession):
def _recursive_expunge(_obj):
if hasattr(_obj, '__mapper__'):
for rel in obj.__mapper__.relationships:
try:
dbSession.expunge(rel)
except sqlalchemy.orm.exc.UnmappedInstanceError:
pass
_recursive_expunge(obj)
recursive_expunge(postingObject, self.request.dbSession.writer)
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