this works without any error, comment_after_insert_listener() prints
that target.report.comments_count = 1, but this value isn't commited...
Can't get why prev testcase fails, this works,
but target.report.comments_count value isn't saved :/
def comment_after_insert_listener(mapper, connection, target):
target.report.comments_count = target.report.comments_count + 1
print target.report.comments_count
event.listen(Comment, 'after_insert', comment_after_insert_listener)
session = Session()
report = session.query(Report).get(1)
comment = Comment(content=u'test comment', report=report)
session.add(comment)
session.commit()
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