How to filter greater than or is null?

Question

If I want to filter "greater than or equal to", I can use gte :

MyModel.objects.filter(mydatetimefield__gte=mydate)

Likewise, if I want to filter "is none/null", I can use isnull :

MyModel.objects.filter(mydatetimefield__isnull=mydate)

How can I combine these to filter for "greater than or equal to or is null", so the above filter would return both objects if i) mydatetimefield >= mydate , and ii) mydatetimefield == null ?

Answer 1

you use Q statements to perform OR logic

from django.db.models import Q

qry = Q(mydatetimefield=None) | Q(mydatetimefield__gte=mydate)

MyModel.objects.filter(qry)

In keeping with the spirit of Willem Van Onsems alternative suggestion

MyModel.objects.exclude(mydatetimefield__lt=mydate)

Answer 2

You can use Q objects [Django-doc] , and use a bitwise or ( | ) operator to specify a condition that should satisfiy one of the two subconditions:

from django.db.models import 

MyModel.objects.filter(
    mydatetimefield__gte=mydate
    mydatetimefield=None
)

or you can negate the __lt lookup:

from django.db.models import 

MyModel.objects.filter(mydatetimefield__lt=mydate))