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76e38a2177
The option can be used to force pre 1.6 style SELECT on save behaviour.
This is needed in case the database returns zero updated rows even if
there is a matching row in the DB. One such case is PostgreSQL update
trigger that returns NULL.
Reviewed by Tim Graham.
Refs #16649
Backport of e973ee6a98 from master
Conflicts:
django/db/models/options.py
tests/basic/tests.py
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