Base Model file

from django.db import models

# Create your models here.
class BaseModel(models.Model):
    created_at = models.DateTimeField(auto_now_add=True)
    updated_at = models.DateTimeField(auto_now=True)

    class Meta:
        abstract = True

User Model file

from django.db import models
from django.contrib.auth.models import (
	AbstractBaseUser,
	BaseUserManager,
	PermissionsMixin,
)
from core.models import BaseModel

# Create your models here.
class UserManager(BaseUserManager):
    def create_user(self, email, password=None, **extra_fields):
        if not email:
            raise ValueError("The Email field must be set")
        email = self.normalize_email(email)
        user = self.model(email=email, **extra_fields)
        user.set_password(password)
        user.save(using=self._db)

        return user

    def create_superuser(self, email, password=None):
        user = self.create_user(email, password)
        user.is_staff = True
        user.is_superuser = True
        user.is_active = True
        user.save(using=self._db)

        return user

class User(AbstractBaseUser, BaseModel, PermissionsMixin):
    email = models.EmailField(max_length=255, unique=True, db_index=True)
    first_name = models.CharField(max_length=100, blank=True)
    last_name = models.CharField(max_length=100, blank=True)
    is_active = models.BooleanField(default=True)
    is_staff = models.BooleanField(default=False)

    objects = UserManager()

    USERNAME_FIELD = "email"
    REQUIRED_FIELDS = []

    def get_full_name(self):
        if self.first_name and self.last_name:
            return f"{self.first_name} {self.last_name}"
        else:
            return None

    def __str__(self):
        return self.email

admin.py File

from django.contrib import admin
from django.contrib.auth.admin import UserAdmin as BaseUserAdmin

from accounts.models import User

# Register your models here.
class UserAdmin(BaseUserAdmin):
    ordering = ["id"]
    list_display = ["email", "first_name", "last_name"]
    fieldsets = (
        (None, {"fields": ("email", "password")}),
        ("Personal Info", {"fields": ("first_name", "last_name")}),
        (
            "Permissions",
            {"fields": ("is_active", "is_staff", "is_superuser")},
        ),
    )
    add_fieldsets = (
        (None, {"classes": ("wide",), "fields": ("email", "password1", "password2")}),
    )

admin.site.register(User, UserAdmin)