Author: adrian
Date: 2011-07-05 13:16:08 -0700 (Tue, 05 Jul 2011)
New Revision: 16517
Modified:
django/trunk/docs/ref/models/querysets.txt
Log:
Added another bit to the update() queryset docs about avoiding race conditions
Modified: django/trunk/docs/ref/models/querysets.txt
===================================================================
--- django/trunk/docs/ref/models/querysets.txt 2011-07-05 20:09:00 UTC (rev
16516)
+++ django/trunk/docs/ref/models/querysets.txt 2011-07-05 20:16:08 UTC (rev
16517)
@@ -1328,6 +1328,10 @@
Entry.objects.get(id=10).update(comments_on=False)
+Using ``update()`` instead of loading the object into memory also prevents a
+race condition where something might change in your database in the short
+period of time between loading the object and calling ``save()``.
+
Finally, note that the ``update()`` method does an update at the SQL level and,
thus, does not call any ``save()`` methods on your models, nor does it emit the
``pre_save`` or ``post_save`` signals (which are a consequence of calling
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