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authorTim Graham <timograham@gmail.com>2018-01-29 10:12:58 -0500
committerTim Graham <timograham@gmail.com>2018-01-29 12:37:05 -0500
commitbbc4a5a792c4987eb143d1a9f09fd939f4609481 (patch)
treec6d39d497941315186079cc014167dc7e94849f4
parentc2962d8147380b00bb965c0d42b7e05ca4596868 (diff)
[2.0.x] Fixed #29081 -- Clarified comments in QuerySet.select_related() example.
Backport of e6f0e324e28bc7d0c125415de871466aa1f4b983 from master
-rw-r--r--docs/ref/models/querysets.txt4
1 files changed, 3 insertions, 1 deletions
diff --git a/docs/ref/models/querysets.txt b/docs/ref/models/querysets.txt
index 5f5f73c830..8e4b7df216 100644
--- a/docs/ref/models/querysets.txt
+++ b/docs/ref/models/querysets.txt
@@ -941,11 +941,13 @@ following models::
... then a call to ``Book.objects.select_related('author__hometown').get(id=4)``
will cache the related ``Person`` *and* the related ``City``::
+ # Hits the database with joins to the author and hometown tables.
b = Book.objects.select_related('author__hometown').get(id=4)
p = b.author # Doesn't hit the database.
c = p.hometown # Doesn't hit the database.
- b = Book.objects.get(id=4) # No select_related() in this example.
+ # Without select_related()...
+ b = Book.objects.get(id=4) # Hits the database.
p = b.author # Hits the database.
c = p.hometown # Hits the database.