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

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Hannes Ljungberg 2021-10-04 10:20:34 +02:00 committed by GitHub
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docs/ref/models/querysets.txt
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@ -1773,6 +1773,12 @@ to refer to the queryset's model.
Restaurant.objects.select_for_update(of=('self', 'place_ptr')) 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 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 lock, that still allows creating rows that merely reference locked rows
(through a foreign key, for example) while the lock is in place. The (through a foreign key, for example) while the lock is in place. The