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Code Issues 32 Releases Wiki Activity

Refs #36042 -- Raised ValueError when providing composite expressions to aggregates.

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This commit is contained in:
Jacob Walls
2025-01-05 10:09:46 -05:00
committed by Sarah Boyce
parent 6eec703667
commit 470e5545e5
8 changed files with 39 additions and 5 deletions
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10
docs/topics/composite-primary-key.txt
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@@ -131,6 +131,8 @@ database.
``ForeignObject`` is an internal API. This means it is not covered by our
:ref:`deprecation policy <internal-release-deprecation-policy>`.
.. _cpk-and-database-functions:
Composite primary keys and database functions
=============================================
@@ -141,13 +143,15 @@ Many database functions only accept a single expression.
MAX("order_id") -- OK
MAX("product_id", "order_id") -- ERROR
As a consequence, they cannot be used with composite primary key references as
they are composed of multiple column expressions.
In these cases, providing a composite primary key reference raises a
``ValueError``, since it is composed of multiple column expressions. An
exception is made for ``Count``.
.. code-block:: python
Max("order_id") # OK
Max("pk") # ERROR
Max("pk") # ValueError
Count("pk") # OK
Composite primary keys in forms
===============================