code: def get_nodes(self, request):
          
          nodes = []
          nodes.append(NavigationNode(_('Authors'),
                                      reverse('zinnia:author_list'),
                                      'authors'))
          for author in Author.published.all():
              nodes.append(NavigationNode(author.__str__(),
                                          author.get_absolute_url(),
                                          author.pk, 'authors'))
          return nodes
docs: Return menu's node for authors