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

from django.db import models

class CustomUserWithUniqueConstraintManager(BaseUserManager):

    def create_superuser(self, username, password):

        user = self.model(username=username)

        user.set_password(password)

        user.save(using=self._db)

        return user

class CustomUserWithUniqueConstraint(AbstractBaseUser):

    username = models.CharField(max_length=150)

    objects = CustomUserWithUniqueConstraintManager()

    USERNAME_FIELD = "username"

    class Meta:

        constraints = [

            models.UniqueConstraint(fields=["username"], name="unique_custom_username"),

        ]