from django.db import models
from django.contrib.auth.models import User


class ClassAtSchool(models.Model):
    name = models.CharField(max_length=30, unique=True, blank=False)

    def __str__(self):
        return self.name


class Teacher(models.Model):
    user = models.OneToOneField(User, on_delete=models.CASCADE)
    class_at_school = models.ManyToManyField(ClassAtSchool)

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


class Student(models.Model):
    user = models.OneToOneField(User, on_delete=models.CASCADE)
    class_at_school = models.ForeignKey(ClassAtSchool, on_delete=models.CASCADE)

    class Meta:
        ordering = ['user']

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







'''1 klasa może mieć kilku nauczycieli a 1 nauczyciel może mieć kilka klas many-to-many'''
'''1 klasa może mieć kilku studentów one-to-many'''
'''https://docs.djangoproject.com/en/3.1/topics/db/examples/many_to_many/'''

'''https://medium.com/hackernoon/django-orm-relationships-cheat-sheet-14433d6cf68c'''