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Refs #28643 -- Changed StdDev() to use NumericOutputFieldMixin.

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Keeps precision instead of forcing DecimalField to FloatField.
This commit is contained in:
Nick Pope 2018-12-19 23:03:42 +00:00 • committed by Tim Graham
parent c690afb873
commit e85afa5943
4 changed files with 9 additions and 8 deletions
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5
docs/ref/models/querysets.txt
View file

@ -3387,12 +3387,13 @@ by the aggregate.
``StdDev``
~~~~~~~~~~
.. class:: StdDev(expression, sample=False, filter=None, **extra)
.. class:: StdDev(expression, output_field=None, sample=False, filter=None, **extra)
Returns the standard deviation of the data in the provided expression.
* Default alias: ``<field>__stddev``
* Return type: ``float``
* Return type: ``float`` if input is ``int``, otherwise same as input
field, or ``output_field`` if supplied
Has one optional argument:

5
docs/releases/2.2.txt
View file

@ -493,8 +493,9 @@ Miscellaneous
* :djadmin:`runserver` no longer supports `pyinotify` (replaced by Watchman).
* The :class:`~django.db.models.Avg` aggregate function now returns a
``Decimal`` instead of a ``float`` when the input is ``Decimal``.
* The :class:`~django.db.models.Avg` and :class:`~django.db.models.StdDev`
aggregate functions now return a ``Decimal`` instead of a ``float`` when the
input is ``Decimal``.
.. _deprecated-features-2.2: