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
3768	NullBooleanField cannot be a primary key	moof@…	Jacob	"I'm trying to implement the MS SQL Server backend (see #2358) and I find the following regression test in [source:django/trunk/tests/regressiontests/serializers_regress/models.py#4757 the serializer regression tests]:

{{{
#!python
class NullBooleanPKData(models.Model):
    data = models.NullBooleanField(primary_key=True)
}}}

Under MS SQL Server, no nullable field can be a primary key, and so I'm unable to pass this test at all.

My suggestion: delete the test. To me, it makes no sense.

However, since it seems to be the only test of its type, I suspect it was put in there for a reason. I'd love to hear alternatives as to how to deal with this issue."		closed	Core (Serialization)	dev		fixed	tests		Design decision needed	0	0	0	0	0	0