#17186: Inverted F expression (negation)
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Reporter: niwi | Owner: nobody
Type: New feature | Status: new
Component: Database layer | Version: SVN
(models, ORM) | Resolution:
Severity: Normal | Triage Stage: Accepted
Keywords: | Needs documentation: 1
Has patch: 1 | Patch needs improvement: 1
Needs tests: 1 | UI/UX: 0
Easy pickings: 0 |
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Comment (by lrekucki):
One more thing worth documenting, due to difference in None and NULL
semantics:
{{{#!python
class A(Model):
f = NullBooleanField()
for m in A.objects.all():
m.f = not m.f; m.save() # all NULL values are now True
# while this will leave NULL values unchanged as NOT NULL is NULL
A.objects.update(f=not F('f'))
}}}
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Ticket URL: <https://code.djangoproject.com/ticket/17186#comment:7>
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