Hello,
I wrote a script to convert from an old database (turbogears) to
django. It involved a few loops like this:
for oldm in messages:
newm = models.Message()
newm.date = oldm.date
newm.text = oldm.text
newm.save()
After running the script, I discovered that all the messages in the
new DB had the same date. This was very strange, because everything
else was ok. This was even more strange, because this worked fine:
>>> m = models.Message.objects.get(id=1)
>>> m.date = datetime(2007, 4, 4)
>>> m.save()
It took me a very long and unpleasant hour to discover that it was
because the date field had auto_now_add=True. I fixed my script, so
now the loop looks like this:
for oldm in messages:
newm = models.Message()
newm.text = oldm.text
newm.save()
newm.date = oldm.date
newm.save()
The conclusion is that auto_now_add should set the date only if it is
None. Or, another solution: it should set the date upon instance
creation, not upon saving.
Do you agree?
Noam
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