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大家好，我是 Backbone.js 的新手。我正在尝试让我的收藏与基于 RESTful python 谷歌应用引擎的后端一起工作。这是服务器上使用的代码：

def getJson():
    tweets_out = []

    tweets = getModTweets()
    for tweet in tweets:
        temp = {}
        temp["screen_name"] = tweet.screen_name
        temp["text"] = tweet.text
        temp["profile_image_url"] = tweet.profile_image_url
        temp["id"] = tweet.id
        temp["created_at_time"] = tweet.created_at_time
        temp["created_at_epoch"] = tweet.created_at_epoch
        temp["time_lapsed"] = tweet.time_lapsed
        tweets_out.append(temp)


    a = json.dumps(tweets_out)

    return a

生成的 JSON 如下：

[{"screen_name": "spolsky", "text": "@greeleygeek I'm going to start doing that", "profile_image_url": "http://a0.twimg.com/profile_images/1770014670/image1327118364_normal.png", "time_lapsed": "3 days ago", "created_at_epoch": 1346464678, "created_at_time": "2012-9-1 01:57:58", "id": 15948437}, {"screen_name": "spolsky", "text": "@phlix google analytics.", "profile_image_url": "http://a0.twimg.com/profile_images/1770014670/image1327118364_normal.png", "time_lapsed": "4 days ago", "created_at_epoch": 1346439185, "created_at_time": "2012-8-31 18:53:05", "id": 15948437}, {"screen_name": "spolsky", "text": "@AdityaAthalye we make it up in volume!", "profile_image_url": "http://a0.twimg.com/profile_images/1770014670/image1327118364_normal.png", "time_lapsed": "4 days ago", "created_at_epoch": 1346425278, "created_at_time": "2012-8-31 15:01:18", "id": 15948437}]

我尝试使用以下两种方法尝试通过以下两种方式填充我的集合，但均未成功：

  var Tweet = Backbone.Model.extend({
        urlRoot : '/tweets.json'
    });


  var Tweets = Backbone.Collection.extend({
        model: Tweet,
        url: '/bulktweets.json'
  });

     var tweets2 = new Tweets();    

    //method 1
tweets2.reset(JSON STRING LISTED ABOVE);
    //Yes tweets2.reset([{"screen_name": "spolsky", "text": "@greeleygeek I'm going to          start doing that", "profile_image_url": "http://a0.twimg.com/profile_images/1770014670/image1327118364_normal.png", "time_lapsed": "3 days ago", "created_at_epoch": 1346464678, "created_at_time": "2012-9-1 01:57:58", "id": 15948437}, {"screen_name": "spolsky", "text": "@phlix google analytics.", "profile_image_url": "http://a0.twimg.com/profile_images/1770014670/image1327118364_normal.png", "time_lapsed": "4 days ago", "created_at_epoch": 1346439185, "created_at_time": "2012-8-31 18:53:05", "id": 15948437}, {"screen_name": "spolsky", "text": "@AdityaAthalye we make it up in volume!", "profile_image_url": "http://a0.twimg.com/profile_images/1770014670/image1327118364_normal.png", "time_lapsed": "4 days ago", "created_at_epoch": 1346425278, "created_at_time": "2012-8-31 15:01:18", "id": 15948437}

]);

    //method 2
    tweets2.fetch();

溢出者可能会指出我正确的方向吗？提前致谢。

更新： 我能够与服务器通信，但整个集合不只解析第一个元素。

为什么我会得到集合，即 tweets2.length 返回长度为 1 而不是预期的 5？有人可以阐明一些吗？

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1 回答 1

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假设你的意思是tweets2.fetch()这里可能会发生什么。

首先，这一行：

tweets2.reset(JSON STRING LISTED ABOVE);

你是传入一个 json 字符串还是一个 json 数组？使用重置，如果您只是传入模型属性，则应将其作为 json 数组/对象传入。

tweets2.reset("[{'name':'bluejay'},{'name':'cardinal'}]");  // STRING, no good.

tweets2.reset( [{'name':'bluejay'},{'name':'cardinal'}] );  // as json object array, okay!

对于您tweets.fetch()，您尚未定义或实例化变量tweets。我想你的意思是...

tweets2.fetch();

如果你的服务器设置正确，返回一个 json 对象，那么你应该很高兴。

于 2012-09-05T00:08:39.950 回答