[6.0.x] Fixed #36847 -- Ensured auto_now_add fields are set on pre_save().

Regression in 94680437a45a71c70ca8bd2e68b72aa1e2eff337. 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.

Backport of fe189dc43ab3eddbbceefb6834893b73ca60d5ed from main.

1 files changed, 3 insertions, 1 deletions

diff --git a/django/db/models/base.py b/django/db/models/base.py
index d6aed20199..c02ca7b513 100644
--- a/django/db/models/base.py
+++ b/django/db/models/base.py
@@ -1153,7 +1153,9 @@ class Model(AltersData, metaclass=ModelBase):
             ].features.can_return_columns_from_insert
             for field in insert_fields:
                 value = (
-                    getattr(self, field.attname) if raw else field.pre_save(self, False)
+                    getattr(self, field.attname)
+                    if raw
+                    else field.pre_save(self, add=True)
                 )
                 if hasattr(value, "resolve_expression"):
                     if field not in returning_fields: