From c185224fd094053ec4dc029e68a78304fc2a2864 Mon Sep 17 00:00:00 2001
From: gabn88 <gerben_m88@hotmail.com>
Date: Sun, 13 Jun 2021 06:37:46 +0200
Subject: [PATCH] Fix extra actions button not showing with namespaces

See https://github.com/encode/django-rest-framework/issues/7500
I'm already using this in production for a long time, but of course a test case would be even better.
---
 rest_framework/viewsets.py | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/rest_framework/viewsets.py b/rest_framework/viewsets.py
index 5a1f8acf5..43cd6c8ad 100644
--- a/rest_framework/viewsets.py
+++ b/rest_framework/viewsets.py
@@ -198,6 +198,9 @@ class ViewSetMixin:
         for action in actions:
             try:
                 url_name = '%s-%s' % (self.basename, action.url_name)
+                namespace = self.request.resolver_match.namespace
+                if namespace:
+                    url_name = '%s:%s' % (namespace, url_name) 
                 url = reverse(url_name, self.args, self.kwargs, request=self.request)
                 view = self.__class__(**action.kwargs)
                 action_urls[view.get_view_name()] = url