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

user_model = get_user_model()
root_user = user_model.objects.get(id=0)

class Profile(models.Model):
    username = models.CharField(max_length=255, primary_key=True)
    referred_by = models.ForeignKey(user_model, default=root_user, on_delete=models.CASCADE)

    class Meta:
        managed = True
        db_table = 'profiles'

    def __str__(self):
        return self.username