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[4.0.x] Fixed #32888 -- Doc'd that select_for_update() only locks tables with selected columns.

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Backport of d400b08a8b from main
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Hannes Ljungberg
2021-10-04 10:20:34 +02:00
committed by Mariusz Felisiak
parent 7fa946c76b
commit 816e809302
1 changed files with 6 additions and 0 deletions
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6
docs/ref/models/querysets.txt
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@@ -1775,6 +1775,12 @@ to refer to the queryset's model.
Restaurant.objects.select_for_update(of=('self', 'place_ptr'))
.. admonition:: Using ``select_for_update(of=(...))`` with specified fields
If you want to lock models and specify selected fields, e.g. using
:meth:`values`, you must select at least one field from each model in the
``of`` argument. Models without selected fields will not be locked.
On PostgreSQL only, you can pass ``no_key=True`` in order to acquire a weaker
lock, that still allows creating rows that merely reference locked rows
(through a foreign key, for example) while the lock is in place. The