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+Hahaha
+# Please enter the commit message for your changes. Lines starting
+# with '#' will be ignored, and an empty message aborts the commit.
+#
+# On branch master
+# Changes to be committed:
+#	modified:   lib/shotengai/json_column.rb
+#	modified:   lib/shotengai/product.rb
+#

lib/shotengai/json_column.rb

 module Shotengai
   module JsonColumn
     extend ActiveSupport::Concern
+    
     included do
     end
 

lib/shotengai/product.rb

@@ -127,6 +127,7 @@ module Shotengai
       # "#{tag_name}_list" tag_name is singular
       # tagger_with('xx', on: "#{tag_name}.to_sym): tag_name is plural
       # include JoinCatalog
+      require 'acts-as-taggable-on' 
       def join_catalog_system catalog_class_name, options={}
         catalog_class = catalog_class_name.constantize
         tag_name = options[:as] || catalog_class.model_name.singular