base : https://chartio.com/resources/tutorials/how-to-filter-for-empty-or-null-values-in-a-django-queryset/
CampaignSelection.objects.filter(post_save_date__isnull=True)
Sometimes you gotta run before you can walk.
base : https://chartio.com/resources/tutorials/how-to-filter-for-empty-or-null-values-in-a-django-queryset/
CampaignSelection.objects.filter(post_save_date__isnull=True)