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Is there an alternative to raw sql query?
class Teacher(models.Model):
       schools = models.ManyToManyField(School, db_table="schoolteachers", related_name='scteachers')

def get_teachers(self):

  return ' , '.join(school.name for school in self.scteachers.all())

', '.join(School.objects.filter(
  other_way_from_school_to_schoolteachers__teacher__pk=self.pk
  ).values_list('name', flat=True))