Question

I have following models setup in my Django application

 class School(models.Model):
   name  = models.TextField()

 class Courses(models.Model):
   name  = models.TextField()
   schools = ManyToManyField(School)

Now, I want to find out all schools which offer a particular course. For example, find all schools which offer biology and chemistry. What query can I use?

thanks

Answer 1

See lookup that span relationships in the manual:

class Courses(models.Model):
   name  = models.TextField()
   schools = ManyToManyField(School, related_name='courses_set')

School.objects.filter(courses_set__name__in=('biology', 'chemistry'))