no message

store/admin.py

@@ -29,6 +29,7 @@ class CategoryAdmin(admin.ModelAdmin):
         return object.__str__()
 
     get_str.short_description = 'Полный путь'
+    get_str.admin_order_field = 'title'
 
     list_display = ('title', get_str,)
     prepopulated_fields = {"slug": ("title",)}