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Fixed #10303 -- Corrected a contradiction in the docs regarding the capabilities of the .update() clause that was introduced by the documentation for F() expressions. Thanks to gluckj for the report.

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git-svn-id: http://code.djangoproject.com/svn/django/trunk@9846 bcc190cf-cafb-0310-a4f2-bffc1f526a37
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Russell Keith-Magee 2009-02-19 22:45:48 +00:00
parent fc02370cee
commit 322a6a9d1d
1 changed files with 3 additions and 3 deletions
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docs/topics/db/queries.txt
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@ -767,9 +767,7 @@ a ``QuerySet``. You can do this with the ``update()`` method. For example::
Entry.objects.filter(pub_date__year=2007).update(headline='Everything is the same')
You can only set non-relation fields and ``ForeignKey`` fields using this
method, and the value you set the field to must be a hard-coded Python value
(i.e., you can't set a field to be equal to some other field at the moment).
method. To update a non-relation field, provide the new value as a constant.
To update ``ForeignKey`` fields, set the new value to be the new model
instance you want to point to. Example::
@ -795,6 +793,8 @@ Just loop over them and call ``save()``::
for item in my_queryset:
item.save()
.. versionadded:: 1.1
Calls to update can also use :ref:`F() objects <query-expressions>` to update
one field based on the value of another field in the model. This is especially
useful for incrementing counters based upon their current value. For example, to