How to implement ManyToManyField queries in Django?

Question

Django

There is a table:

class Category(models.Model):
  category_name = models.CharField(max_length = 200)	
  category_nested = models.ManyToManyField('self', symmetrical=False)

How to pull out only those category_names that have no links to other rows in the table and only those category_names that have links?

Answer 1

Category.objects.filter(category_nested=[])
Category.objects.exclude(category_nested=[])