Improve JsonColumn code style and add reader "#{key}_rewrited"

lib/shotengai/harray.rb

@@ -45,5 +45,9 @@ module Shotengai
     def hash_map
       self.map { |obj| yield obj['key'], obj['val']}
     end
+
+    def merge hash
+      self.decode.merge(hash)
+    end
   end
 end

lib/shotengai/json_column.rb

@@ -36,28 +36,35 @@ module Shotengai
 
       def template_with_value key, value: "#{key}_value", template: "#{key}_template", rewrite: "#{key}_rewrite", trans: nil, trans_to: :en
         trans_result = trans.is_a?(Hash) ? %Q{
-          {
-            #{trans_to}_value: val&.reduce({}) do |o, obj| 
-              trans = #{trans}
-              val = obj[1].is_a?(Array) ? obj[1].map{ |x| trans[x] } : trans[ obj[1] ]
-              o.merge( obj[0] => val )
-            end
-          }
-        } : '{}'
+          #{trans_to}_value: val&.reduce({}) do |o, obj| 
+            val = obj[1].is_a?(Array) ? obj[1].map{ |x| #{trans}[x] } : #{trans}[ obj[1] ]
+            o.merge( obj[0] => val )
+          end ,
+        } : ''
 
         # QUESTION: 在继承时 self will get (Object doesn't support #inspect)
         has_rewrite_column = self.has_attribute?(rewrite) rescue superclass.has_attribute?(rewrite)
-        rewrite_key_val = has_rewrite_column ? "rewrite: #{rewrite}" : ''
 
+        rewrite_key_val, define_rewrited_reader = 
+          if has_rewrite_column 
+            [
+              "rewrite: #{rewrite},",
+              "def #{key}_rewrited; #{value}.merge(#{rewrite}); end;"
+            ]
+          end
+          
         class_eval %Q{
           def #{key}
             val = #{value}.is_a?(Harray) ? #{value}.decode : #{value}
             {
               template: Shotengai::Harray.encode(#{template}).keys,
               value: val,
+              #{trans_result}
               #{rewrite_key_val}
-            }.merge(#{trans_result})
+            }
           end
+
+          #{define_rewrited_reader}
         }
       end