diff options
Diffstat (limited to 'docs/ref')
| -rw-r--r-- | docs/ref/models/querysets.txt | 4 |
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. |