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

2021-08-25 13:44:08 +02:00 · 2021-08-25 13:44:08 +02:00 · 7ea86076fc
parent 55cf9e93b5
commit 7ea86076fc
1 changed files with 3 additions and 0 deletions
--- a/docs/ref/models/querysets.txt
+++ b/docs/ref/models/querysets.txt
@ -2291,6 +2291,9 @@ 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
 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()``
 ~~~~~~~~~~~~~