Register all models to admin from app for Django.

register_all_models_for_django_admin.py

app_models = get_app('app_name')

for model in get_models(app_models):
    try:
        admin.site.register(model)
    except AlreadyRegistered:
        pass
    
#use this if you want to register a model with specific definition
#admin.site.unregister(ModelName)