Fix the last commit

lib/shotengai/json_column.rb

@@ -37,7 +37,7 @@ module Shotengai
       def template_with_value key, value: "#{key}_value", template: "#{key}_template"
         class_eval %Q{
           def #{key}
-            val = value.is_a?(Harray) ? value.decode : value
+            val = #{value}.is_a?(Harray) ? #{value}.decode : value
             {
               template: Shotengai::Harray.encode(#{template}).keys,
               value: val,