The code tries to handle a scenario like the following (of course, the
statements can be relatively ordered in different ways). Can you describe
how the scenario which fails for you looks like? I am assuming you are
using READ COMMITTED, and that the lookup fields are unique together.
THREAD1 THREAD2
SELECT => not found
SELECT => not found
BEGIN
INSERT => success
COMMIT
BEGIN
INSERT => integrity error
ROLLBACK
(enter except IntegrityError)
SELECT => ??? (should be success)
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