# documentação Django 2.0.8

# Código fonte para django.contrib.admin.decorators

    def register(*models, site=None):
        """
        Register the given model(s) classes and wrapped ModelAdmin class with
        admin site:

        @register(Author)
        class AuthorAdmin(admin.ModelAdmin):
            pass

        The `site` kwarg is an admin site to use instead of the default admin site.
        """
        from django.contrib.admin import ModelAdmin
        from django.contrib.admin.sites import site as default_site, AdminSite

        def _model_admin_wrapper(admin_class):
            if not models:
                raise ValueError('At least one model must be passed to register.')

            admin_site = site or default_site

            if not isinstance(admin_site, AdminSite):
                raise ValueError('site must subclass AdminSite')

            if not issubclass(admin_class, ModelAdmin):
                raise ValueError('Wrapped class must subclass ModelAdmin.')

            admin_site.register(models, admin_class=admin_class)

            return admin_class
        return _model_admin_wrapper