Hahaha

lib/shotengai/product.rb

@@ -126,7 +126,39 @@ module Shotengai
       # Will get methods:
       # "#{tag_name}_list" tag_name is singular
       # tagger_with('xx', on: "#{tag_name}.to_sym): tag_name is plural
-      include JoinCatalog
+      # include JoinCatalog
+      def join_catalog_system catalog_class_name, options={}
+        catalog_class = catalog_class_name.constantize
+        tag_name = options[:as] || catalog_class.model_name.singular
+        acts_as_taggable_on tag_name.to_sym
+        list_name = "#{tag_name}_list".to_sym
+        class_eval do
+          # define_method("#{tag_name}_list=") { |value|
+          #   super catalog_class.validate_name_chain(value)
+          # }
+
+          scope "#{list_name}_filter".to_sym, ->(catalogs) { 
+            tags = catalogs && catalogs.try(:tag) || catalogs.any? && catalogs&.map(&:tag)
+            tags ? tagged_with(tags, on: list_name) : all
+          }
+
+          define_method("#{tag_name}_ids=") { |ids|
+            send("#{list_name}=", catalog_class.ids_to_tags(ids))
+          }
+
+          define_method("#{tag_name}_ids") {
+            send(list_name).map(&:id)
+          }
+
+          define_method("#{tag_name}_names") {
+            send(list_name).map(&:name)
+          }
+
+          define_method(list_name) {
+            catalog_class.unscope(:order).where(id: super().map { |tag| Shotengai::Catalog.parse_tag(tag) }).order(:nested_level)
+          }
+        end
+      end
     end
   end
 end