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Fixed #16063 -- Adjusted admin changelist searches spanning multi-valued relationships.

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This reduces the likelihood of admin searches issuing queries with
excessive joins.
This commit is contained in:
Jacob Walls
2021-10-05 21:38:15 -04:00
committed by Mariusz Felisiak
parent e1d673c373
commit 76ccce64cc
6 changed files with 102 additions and 4 deletions
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docs/releases/4.1.txt
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@@ -290,6 +290,26 @@ Dropped support for MariaDB 10.2
Upstream support for MariaDB 10.2 ends in May 2022. Django 4.1 supports MariaDB
10.3 and higher.
Admin changelist searches spanning multi-valued relationships changes
---------------------------------------------------------------------
Admin changelist searches using multiple search terms are now applied in a
single call to ``filter()``, rather than in sequential ``filter()`` calls.
For multi-valued relationships, this means that rows from the related model
must match all terms rather than any term. For example, if ``search_fields``
is set to ``['child__name', 'child__age']``, and a user searches for
``'Jamal 17'``, parent rows will be returned only if there is a relationship to
some 17-year-old child named Jamal, rather than also returning parents who
merely have a younger or older child named Jamal in addition to some other
17-year-old.
See the :ref:`spanning-multi-valued-relationships` topic for more discussion of
this difference. In Django 4.0 and earlier,
:meth:`~django.contrib.admin.ModelAdmin.get_search_results` followed the
second example query, but this undocumented behavior led to queries with
excessive joins.
Miscellaneous
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