File: with_foreign_key.py

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from django.contrib.auth.models import AbstractBaseUser, BaseUserManager, Group
from django.db import models


class Email(models.Model):
    email = models.EmailField(verbose_name="email address", max_length=255, unique=True)


class CustomUserWithFKManager(BaseUserManager):
    def create_superuser(self, username, email, group, password):
        user = self.model(username_id=username, email_id=email, group_id=group)
        user.set_password(password)
        user.save(using=self._db)
        return user


class CustomUserWithFK(AbstractBaseUser):
    username = models.ForeignKey(Email, models.CASCADE, related_name="primary")
    email = models.ForeignKey(
        Email, models.CASCADE, to_field="email", related_name="secondary"
    )
    group = models.ForeignKey(Group, models.CASCADE)

    custom_objects = CustomUserWithFKManager()

    USERNAME_FIELD = "username"
    REQUIRED_FIELDS = ["email", "group"]