[Answered ]-Django contains None (or reversed contain)

Here is the reverse of __contains:

from django.db.models import Q

qs = MyModel.objects.filter(~Q(icon__contains='any string'))

If you want to check if value is None you could use isnull e.g. Do not include those objects for which icon is None:

qs = MyModel.objects.filter(icon__isnull=True)