django_admin_register_all.py

def register_all(app_label):
    """Function for django admin.
    Register all app models in django admin.
    """
    from django.apps import apps
    from django.contrib import admin
    from django.contrib.admin.sites import AlreadyRegistered

    app_models = apps.get_app_config(app_label).get_models()
    for model in app_models:
        try:
            admin.site.register(model)
        except AlreadyRegistered:
            pass