old_contents: 'use strict';
  
  var apiService = require('../apiService').getInstance();
  
  function DailyMenuResponse() {
  
  }
  
  DailyMenuResponse.prototype = {
      getResponse: function () {
          var products = apiService.getSellingMenus(categoryId);
          var response = {
              attachment: {
                  type: "template",
                  payload: {
                      template_type: "button",
                      text: "Witch Product do you want?",
                      buttons: []
                  }
              }
          };
  
          if (products !== undefined) {
              var productNo = 0;
              products.forEach(function (product) {
                  if (productNo < 3) {
                      var newButton = {
                          type: "postback",
                          title: product.name,
                          payload: "product#" + product._id
                      };
  
                      response.attachment.payload.buttons.push(newButton);
                  }
              });
          }
  
          return JSON.stringify(response);
      }
  };
  
  /**
   * @returns {DailyMenuResponse}
   */
  module.exports.getInstance = function () {
      return new DailyMenuResponse();
  };
  
new_contents: 'use strict';
  
  var apiService = require('../apiService').getInstance();
  
  function DailyMenuResponse() {
  
  }
  
  DailyMenuResponse.prototype = {
      getResponse: function () {
          var date = new Date().toISOString().replace(/T.+/, '');
          var products = apiService.getSellingMenus(date);
  
          var response = {
              attachment: {
                  type: "template",
                  payload: {
                      template_type: "button",
                      text: "Witch Product do you want?",
                      buttons: []
                  }
              }
          };
  
          if (products !== undefined) {
              var productNo = 0;
              products.forEach(function (product) {
                  if (productNo < 3) {
                      var newButton = {
                          type: "postback",
                          title: product.name,
                          payload: "product#" + product._id
                      };
  
                      response.attachment.payload.buttons.push(newButton);
                  }
              });
          }
  
          return JSON.stringify(response);
      }
  };
  
  /**
   * @returns {DailyMenuResponse}
   */
  module.exports.getInstance = function () {
      return new DailyMenuResponse();
  };
  
subject: add notifier