Question

I have two objects of the same class (Model) type. I want to check for an intersection on an M2M field. Is there an efficient way to do this without using raw SQL?

Here’s, basically, my current solution.

genres_a = [g for g in profile_a.genres.all()] # Convert to List
genres_b = set([g for g in profile_b.genres.all()]) # Convert to Set

if genres_b.intersection(genres_a): # Look for Intersection (Not Lazy)
    print True # Do something...

Answer 1

If I understood intersection right:

profile_a.genres.all().filter(id__in=profile_b.genres.all())