modify tiding identifier func

app/models/tiding.rb

@@ -13,9 +13,14 @@ class Tiding < ApplicationRecord
       value = container.try(:identifier)
     end
 
+    if value.blank? && parent_container_type && Object.const_defined?(parent_container_type)
+      value = parent_container_type.try(:identifier)
+    end
+
     if value.blank? && belong_container_type && Object.const_defined?(belong_container_type)
       value = belong_container.try(:identifier)
     end
+
     value
   end
 end