Django filter the model on ManyToMany count?

Question

Suppose I have something like this in my models.py:

class Hipster(models.Model):
  name = CharField(max_length=50)

class Party(models.Model):
  organiser =          


        

Answer 1

Derived from @Yuji-'Tomita'-Tomita answer, I've also added .distinct('id') to exclude the duplitate records:

Party.objects.filter(organizer=user, participants__isnull=False).distinct('id')

Therefore, each party is listed only once.