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Fixed #9255: Removed now-obsolete warning about the old semantics of __exact=None vs. __isnull=True 

git-svn-id: http://code.djangoproject.com/svn/django/trunk@9105 bcc190cf-cafb-0310-a4f2-bffc1f526a37
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James Bennett 2008-09-30 22:29:58 +00:00
parent 8e608c2155
commit 73c0db8e42
1 changed files with 0 additions and 8 deletions
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docs/ref/models/querysets.txt
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@ -1182,14 +1182,6 @@ SQL equivalent::
SELECT ... WHERE pub_date IS NULL;
.. admonition:: ``__isnull=True`` vs ``__exact=None``
There is an important difference between ``__isnull=True`` and
``__exact=None``. ``__exact=None`` will *always* return an empty result
set, because SQL requires that no value is equal to ``NULL``.
``__isnull`` determines if the field is currently holding the value
of ``NULL`` without performing a comparison.
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