Fixed #30953 -- Made select_for_update() lock queryset's model when using "self" with multi-table inheritance.

Thanks Abhijeet Viswa for the report and initial patch.

1 files changed, 6 insertions, 0 deletions

diff --git a/docs/releases/2.2.8.txt b/docs/releases/2.2.8.txt
index 4d8f9869c5..3c5eb5c754 100644
--- a/docs/releases/2.2.8.txt
+++ b/docs/releases/2.2.8.txt
@@ -17,3 +17,9 @@ Bugfixes
 * Fixed a regression in Django 2.2.1 that caused a crash when migrating
   permissions for proxy models with a multiple database setup if the
   ``default`` entry was empty (:ticket:`31021`).
+
+* Fixed a data loss possibility in the
+  :meth:`~django.db.models.query.QuerySet.select_for_update()`. When using
+  ``'self'`` in the ``of`` argument with :ref:`multi-table inheritance
+  <multi-table-inheritance>`, a parent model was locked instead of the
+  queryset's model (:ticket:`30953`).