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[3.2.x] Fixed #33046 -- Added note about using length of cached result by QuerySet.count().

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Backport of 7ea86076fc1128d43b47f4826cb25eb5ebb19f19 from main
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Can Sarıgöl 2021-08-25 13:44:08 +02:00 committed by Mariusz Felisiak
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docs/ref/models/querysets.txt
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@ -2292,6 +2292,9 @@ retrieving model instances from it (for example, by iterating over it), it's
probably more efficient to use ``len(queryset)`` which won't cause an extra probably more efficient to use ``len(queryset)`` which won't cause an extra
database query like ``count()`` would. database query like ``count()`` would.
If the queryset has already been fully retrieved, ``count()`` will use that
length rather than perform an extra database query.
``in_bulk()`` ``in_bulk()``
~~~~~~~~~~~~~ ~~~~~~~~~~~~~