old_contents: from django.conf.urls import url
  
  from rest_framework.routers import DefaultRouter
  
  from bulbs.super_features.viewsets import ContentRelationViewSet, RelationViewSet
  
  
  api_v1_router = DefaultRouter()
  api_v1_router.register(
      r"content-relation",
      ContentRelationViewSet,
      base_name="content-relation"
  )
  api_v1_router.register(
      r"relations",
      RelationViewSet,
      base_name="relations"
  )
  
  urlpatterns = [
      url(
          r'content/(?P<pk>\d+)/relations/?$',
          RelationViewSet.as_view(),
          name='content-relations'
      ),
  ]
  
  urlpatterns += api_v1_router.urls
  
new_contents: from django.conf.urls import url
  
  from rest_framework.routers import DefaultRouter
  
  from bulbs.super_features.viewsets import ContentRelationViewSet, RelationViewSet
  
  
  api_v1_router = DefaultRouter()
  api_v1_router.register(
      r"content-relation",
      ContentRelationViewSet,
      base_name="content-relation"
  )
  
  urlpatterns = [
      url(
          r'content/(?P<pk>\d+)/relations/?$',
          RelationViewSet.as_view(),
          name='content-relations'
      ),
  ]
  
  urlpatterns += api_v1_router.urls
  
subject: remove register