Hi, I sometimes have the need to make sure some instances are excluded from a queryset.
This is the way I do it usually:

unwanted_instance = Mymodel.objects.get(pk=bad_luck_number)
uninteresting_stuff_happens()
my_results = MyModel.objects.exclude(id=unwanted_instance.id)

or, if I have more of them:

my_results = MyModel.objects.exclude(id_in=[uw_in1.id, uw_in2.id, uw_in3.id])

This 'feels' a bit clunky, so I tried if I was lucky:

my_ideally_obtained_results = MyModel.objects.exclude(unwanted_instance)

Which doesn't work. But I read here on SO that a subquery can be used as parameter for exclude.
Am I out of luck? Am I missing some functionality (checked the docs, but didn't find any useful pointer)