Question

我正在尝试将数据解析为json文件中的集合视图，该文件中包含每组数据的数字键。 JSON看起来像这样：

{
    "0": {
        "artifact_id": "36",
        "timestamp": "2013-08-20 11:59:00",
        "modified": "2013-08-20 11:59:00",
        "text": "Why did the last one duplicate? I don't think I clicked it twice...",
        "author_desc": "",
        "object_type": "artifact",
        "comments": []
    },
    "1": {
        "artifact_id": "35",
        "timestamp": "2013-08-20 11:57:51",
        "modified": "2013-08-20 11:57:51",
        "text": "This is a new artifact for a new day.",
        "author_desc": "",
        "object_type": "artifact",
        "comments": []
    },
    "2": {
        "artifact_id": "34",
        "timestamp": "2013-08-20 11:57:50",
        "modified": "2013-08-20 11:57:50",
        "text": "This is a new artifact for a new day.",
        "author_desc": "",
        "object_type": "artifact",
        "comments": []
    }
}

如何编写模型解析以将每个条目（0,1,2 ......等）作为数据中的每个模型？

这是我的收藏，下面是Casey的建议添加，但它似乎没有运行解析方法：

var FriendCollection = Backbone.Collection.extend({
    model: FriendModel,
    parse: function(data) {
        console.log('running parse');
        return _.map(data, _.identity);
    }
});
var friendCollection = new FriendCollection();
friendCollection.reset(friendjson);

Answer 1

Collection#reset没有致电parse，也无法拨打parse。您有几个选择：

手动将friendjson转换为数组，并为该数组提供reset。
根本不要reset，只需将friendjson交给集合的构造函数并添加{parse: true} option。
如果您添加reset选项，则将您的收藏集parse替换为您自己的版本{parse: true}。

1 应该非常明显。

2 会是这样的：

var friendCollection = new FriendCollection(friendjson, { parse: true });

演示：http://jsfiddle.net/ambiguous/dbM82/

3 看起来像这样：

var FriendCollection = Backbone.Collection.extend({
    //...
    reset: function(models, options) {
        if(options && options.parse) {
            delete options.parse;
            models = this.parse(models);
        }
        return Backbone.Collection.prototype.reset.call(this, models, options);
    }
});

var friendCollection = new FriendCollection();
friendCollection.reset(friendjson, { parse: true });

演示：http://jsfiddle.net/ambiguous/Rs8es/

Answer 2

使用Collection#parse方法。

var MyCollection = Backbone.Collection.extend({
  parse: function (data) {
    return _.map(data, _.identity);
  }
});

Backbone Js - 解析数据问题

2 个答案: