[Django]-Register custom user model with admin auth

class User(AbstractUser):

    class Meta:
    app_label = 'auth'

This can solve your problem but may cause some errors when you migrate your app. The other hack is define get_app_list in your AdminSite.

I think what you’re looking for is replacing the django user model. To do this, see the answer on this post: Extending the User model with custom fields in Django. I would suggest going the extending route, but that would mean both parent and child model would have to be registered.

If you really want one single model, just set the AUTH_USER_MODEL setting to your model. This essentially replaces the default model.

In your settings.py:

AUTH_USER_MODEL = "appname.UserModelName"

For more info on replacing the user model, see https://docs.djangoproject.com/en/dev/topics/auth/customizing/#substituting-a-custom-user-model.

In admin.py use

from django.contrib.auth.admin import UserAdmin
from django.contrib.auth.models import User

UserAdmin.list_display = ('email', 'first_name', 'last_name', 'is_active', 'date_joined', 'is_staff')

admin.site.register(User, UserAdmin)

Might want to try this:

https://libraries.io/pypi/django-modeladmin-reorder

Custom ordering for the apps and models in the admin app. You can also rename, cross link or exclude models from the app list.

How can I get the new User model to show up under "Authentication and
Authorization"

I had the same concern using Django 3.0, this is how I solved it :

class CustomUser(AbstractUser):
    
     class Meta:
         db_table = 'auth_user'
         app_label = 'auth'

In settings :

AUTH_USER_MODEL = "auth.CustomUser"

try this:

from django.contrib import admin
from django.contrib.auth.admin import UserAdmin
from django.utils.translation import gettext_lazy as _

class AdminExtra(UserAdmin):
    add_form_template = "admin/auth/user/add_form.html"
    change_user_password_template = None
    fieldsets = (
        (None, {"fields": ("username", "password")}),
        (_("Personal info"), {"fields": ("first_name", "last_name", "email", "nick_name")}),
        (
            _("Permissions"),
            {
                "fields": (
                    "is_active",
                    "is_staff",
                    "is_superuser",
                    "groups",
                    "user_permissions",
                ),
            },
        ),
        (_("Important dates"), {"fields": ("last_login", "date_joined")}),
    )
    add_fieldsets = (
        (
            None,
            {
                "classes": ("wide",),
                "fields": ("username", "password1", "password2"),
            },
        ),
    )


admin.site.register(User, AdminExtra)