将JSON数据重新格式化为Javascript对象

Question

我有一组JSON数据，我试图重新格式化，以遵循'Timeline JS‘上描述的javascript对象模型。

这是存储在变量“messages”中的原始JSON数据：

  {
   "user_id": 1,
   "subject_line": "Timeam feugiat invidunt",
   "type": "feugiat",
   "date": "2014,07,5",
   "message": "Butcher letterpress et tousled ea. Id do artisan"
  },
  {
    "user_id": 1,
    "subject_line": "RE: Timeam feugiat invidunt",
    "type": "feugiat",
    "date": "2014,07,7",
    "message": "Butcher letterpress et tousled ea."   
  }

需要将JSON数据重新格式化为以下Javascript对象语法：

      timeline: {
        headline: "User 1", // messages.user_id 
        type: "default",
        text: "tousled",     
        date: [{
          startDate: "2014,07,5", //messages.date
          headline: "Timeam feugiat invidunt" //messages.subject_line
         },
         {
          startDate: "2014,07,7",
          headline: "RE: Timeam feugiat invidunt"
       }]
    }

这是我目前的代码：

function(){
var messagesData;

// API data fetched and stored in 'messages'
messages.each(function(data){
  data = data.toJSON();
  messagesData = {
    timeline: {
      headline: "User " + data.user_id,
      type: "default",
      text: "tousled",     
      date: [{
        startDate: data.date,
        headline: data.subject_line
      }]
    }
  }
});  

}

但是，我要返回的数据只返回一组' date‘数组(这是JSON数据的最后一个日期和主题行)：

timeline: {
        headline: "User 1",
        type: "default",
        text: "tousled",     
        date: [{
          startDate: "2014,07,7",
          headline: "RE: Timeam feugiat invidunt"
         }]
    }

您将如何遍历JSON数据，以便返回所有给定的日期和主题行？

Answer 1

嗨，请看这里的http://plnkr.co/edit/twLsdzFZHmCwMvzwrux6?p=preview，它应该对你有帮助。

var messages = [{
   "user_id": 1,
   "subject_line": "Timeam feugiat invidunt",
   "type": "feugiat",
   "date": "2014,07,5",
   "message": "Butcher letterpress et tousled ea. Id do artisan"
  },
  {
    "user_id": 1,
    "subject_line": "RE: Timeam feugiat invidunt",
    "type": "feugiat",
    "date": "2014,07,7",
    "message": "Butcher letterpress et tousled ea."   
  }];

var storyjs_data = {
    "timeline": {
      "headline": "User" + messages[0].user_id,
      "type": "default",
      "text": "tousled",
      "date": []
    }
  };

  $(messages).each(function(indx, message) {

    var _date = {
      "startDate": message.date,
      "headline": message.subject_line,

    };

    storyjs_data.timeline.date.push(_date);

  });