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fe189dc43a
Regression in 94680437a4. Refs #27222.
During INSERT operations, `field.pre_save()` is called to prepare values
for db insertion. The `add` param must be `True` for `auto_now_add`
fields to be populated. The regression commit passed `False`, causing
`auto_now_add` fields to remain `None` when used by other fields, such
as `upload_to` callables.
Thanks Ran Benita for the report.
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