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Diffstat (limited to 'docs/ref')
| -rw-r--r-- | docs/ref/models/querysets.txt | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/docs/ref/models/querysets.txt b/docs/ref/models/querysets.txt index 3ccd5958fd..f23d4bc598 100644 --- a/docs/ref/models/querysets.txt +++ b/docs/ref/models/querysets.txt @@ -1696,6 +1696,14 @@ specify the related objects you want to lock in ``select_for_update(of=(...))`` using the same fields syntax as :meth:`select_related`. Use the value ``'self'`` to refer to the queryset's model. +.. admonition:: Lock parents models in ``select_for_update(of=(...))`` + + If you want to lock parents models when using :ref:`multi-table inheritance + <multi-table-inheritance>`, you must specify parent link fields (by default + ``<parent_model_name>_ptr``) in the ``of`` argument. For example:: + + Restaurant.objects.select_for_update(of=('self', 'place_ptr')) + You can't use ``select_for_update()`` on nullable relations:: >>> Person.objects.select_related('hometown').select_for_update() |