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select_for_update() QuerySet Method #781
Description
Implement select_for_update() QuerySet method to lock rows until the end of the transaction.
first = await Person.objects.select_for_update().get(id=1)
second = await Person.objects.select_for_update().get(id=2)
async with database.transaction():
first.balance -= 10
first.save()
second.balance += 10
second.save()
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