class Job(models.Model):
    name = models.CharField(max_length=25)

def __repr__(self):
    return '<Job: %s>' % self.name


class UserJob(models.Model):
    user = models.ForeignKey(User)
job = models.ForeignKey(Job)

def __repr__(self):
    return '<UserJob: %s %s>' % (self.user.name, self.job.name)
Django ищет несколько фильтров