Django ORM multiple table join with AbstractUser

Question

I googled but got confused in multiple table join (with 1:1, 1:n, and n:m relations). My models looks like this:

class User(AbstractUser):
    is_student = models.BooleanField(default=False)
    is_teacher = models.BooleanField(default=False)

class Event(models.Model):
    owner_events = models.ForeignKey(User, on_delete=models.CASCADE, related_name='events')
    name = models.CharField(max_length=30)
   date = models.DateTimeField(default=timezone.now)

    def get_absolute_url(self): # defekt
        return reverse('event_detail', kwargs={'pk': self.pk})
        return self.name

    def get_event(self):
        name = escape(self.name)
        date =  escape(self.date)
        return "Name: " + str(name) + " Datum: " + str(date)

class Teacher(models.Model):
    user = models.OneToOneField(User, on_delete=models.CASCADE, primary_key=True)
    interests = models.ManyToManyField(Subject, related_name='interested_teachers') 
    matches = models.ManyToManyField(Match, related_name="teacher_matches")

    def __str__(self):
        return self.user.username

    def get_events(self):
        return "Name: " + str(self.events.name) + "Date: "

    def get_events_adr(self):
        return self.events

    def get_interests(self):
        return "Interests: " + str(self.interests.name)

Here this is how the tables look like in the db:

Classroom_Event

Classroom_Teacher

Classroom_User

In views I want to have events (event_id, name, date) and teachers information (user_id, name) displayed. In SQL it would be something like this:

select classroom_event.id, classroom_event.name, classroom_event.date,
classroom_user.id, classroom_user.username from classroom_event

left join classroom_user on
classroom_event.owner_events_id = classroom_user.id

left join classroom_teacher on 
classroom_user.id = classroom_teacher.user_id

Answer 1

I think there is no need to to create abstract user. just define two model for student and teacher and give theme one_to_one key to default User model, also no need for is student/teacher field too!. just for enabling a better reverse call from User model to this two models, give a related_name in foreign key field, or there will be default "teacher_set" reverse.

for teacher in Teacher.objects.all():
    print(teacher.user.username)

or in reverse:

for user in User.objects.all():
   if user.teacher:
        print(user.teacher.username)