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Diffstat (limited to 'docs')
| -rw-r--r-- | docs/ref/models/querysets.txt | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/docs/ref/models/querysets.txt b/docs/ref/models/querysets.txt index 6a4ec0fb05..fa11555271 100644 --- a/docs/ref/models/querysets.txt +++ b/docs/ref/models/querysets.txt @@ -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 |