id	summary	reporter	owner	description	type	status	component	version	severity	resolution	keywords	cc	stage	has_patch	needs_docs	needs_tests	needs_better_patch	easy	ui_ux
17186	Inverted F expression (negation)	Andrei Antoukh	nobody	"By default, the expression F django, can not make something like:

{{{#!sql
UPDATE ""testmodel"" SET ""done"" = NOT ""testmodel"".""done"";
}}}

The idea is to make updates or queries like this:

{{{#!python
TestModel.objects.update(done=~F('done'))
}}}

Taking as a reference, this model:

{{{#!python
class TestModel(models.Model):
    done = models.BooleanField(default=False)
}}}

Attached is a patch that works for me, but not if it's the best way to do it."	New feature	closed	Database layer (models, ORM)	dev	Normal	duplicate			Accepted	1	1	1	1	0	0