Question

I have 2 models,
Bacon and Eggs that both have ForeignKey to Spam model.

I need to find out the Bacon’s that are not related to Eggs, currently I’m doint it in the following way:

objs = Bacon.objects.select_related.filter(somefilter=value)

for obj in objs:
    if obj.spam.eggsspam.count():
        continue

    do_something()

I’m sure there must be a more optimal way?

Answer 1

Try:

Bacon.objects.filter([m2m_field_name]__isnull=True)