Reverse function with url namespacecing (for api versioning)

[Gonzalo Amadio]

I want to version my api, but cannot make reverse function work.

I am following the namespace versioning schema proposed in the DRF website 
: namespaceversioning 
<https://www.django-rest-framework.org/api-guide/versioning/#namespaceversioning>

I have one app called *authentication* and inside authentication folder I 
have :

 authentication/
 |
  -- models.py, apps.py, admin.py
  -- api_v1/
     |
     -- views.py
     -- serializers.py
     -- urls.py

In my main urls.py, I've defined

urlpatterns = [
    url(r'admin/', admin.site.urls),
    url(r'^api/v1/',include
        ('tektank.apps.authentication.api_v1.urls',namespace='v1')
     ),
    url(r'^$', lambda _: redirect('http://localhost:8888/')),]

This is authentication/api_v1/urls.py

from rest_framework.routers import DefaultRouter                       
from authentication.api_v1.views import UserViewSet                    

app_name = 'authentication'                                            
router = DefaultRouter()                                               
router.register(r'users', UserViewSet, base_name='authentication-user')

urlpatterns = router.urls                                              

And when I execute

./manage.py show_urls

 /api/v1/users/ authentication.api_v1.views.UserViewSet 
v1:authentication-user-list
 /api/v1/users/<pk>/    authentication.api_v1.views.UserViewSet 
v1:authentication-user-detail

When I am trying to reverse for example from shell, I have the following 
error:

> reverse('v1:authentication-user-detail', kwargs={'pk': '5'})
NoReverseMatch: Reverse for 'authentication-user-detail' not found. 
'authentication-user-detail' is not a valid view function or pattern name.
> reverse('authentication:v1:posts-job-detail', kwargs={'pk': '5'})
NoReverseMatch: 'v1' is not a registered namespace inside 'authentication'
> reverse('v1:authentication:posts-job-detail', kwargs={'pk': '5'})
NoReverseMatch: 'authentication' is not a registered namespace inside 'v1'

BUT, if I do not put namespace='v1' in the app urls, like this:

url(r'^api/v1/',include('tektank.apps.authentication.api_v1.urls')

Then the reverse functions works

> reverse('authentication:authentication-user-detail', kwargs={'pk':5})> 
> '/api/v1/users/5/'

I think I am calling the reverse in the wrong way, or maybe some 
configuration? Because if I call the api for example via postman, the 
endpoint is working ok.

Or maybe I am having the wrong approach?

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