old_contents: # -*- coding: utf-8 -*-
  from cms.menu_bases import CMSAttachMenu
  from menus.base import NavigationNode
  from menus.menu_pool import menu_pool
  from django.utils.translation import ugettext_lazy as _, get_language
  from .models import BlogCategory
  
  
  class BlogCategoryMenu(CMSAttachMenu):
      name = _('Blog Category menu')
  
      def get_nodes(self, request):
          nodes = []
          qs = BlogCategory.objects.translated(get_language())
          qs = qs.order_by('parent_id', 'translations__name')
          for category in qs:
              kwargs = { 'category': category.slug }
              node = NavigationNode(
                  category.name,
                  category.get_absolute_url(),
                  category.pk,
                  category.parent_id
              )
              nodes.append(node)
          return nodes
  
  menu_pool.register_menu(BlogCategoryMenu)
  
  
new_contents: # -*- coding: utf-8 -*-
  from cms.menu_bases import CMSAttachMenu
  from menus.base import NavigationNode
  from menus.menu_pool import menu_pool
  from django.db.models.signals import post_save, post_delete
  from django.utils.translation import ugettext_lazy as _, get_language
  from .models import BlogCategory
  
  
  class BlogCategoryMenu(CMSAttachMenu):
      name = _('Blog Category menu')
  
      def get_nodes(self, request):
          nodes = []
          qs = BlogCategory.objects.translated(get_language())
          qs = qs.order_by('parent_id', 'translations__name')
          for category in qs:
              kwargs = { 'category': category.slug }
              node = NavigationNode(
                  category.name,
                  category.get_absolute_url(),
                  category.pk,
                  category.parent_id
              )
              nodes.append(node)
          return nodes
  
  menu_pool.register_menu(BlogCategoryMenu)
  
  
  def clear_menu_cache(**kwargs):
      menu_pool.clear(all=True)
  
  post_save.connect(clear_menu_cache, sender=BlogCategory)
  post_delete.connect(clear_menu_cache, sender=BlogCategory)
  
subject: handle menu cache