Json Backbone.js 模型与集合

我有两个模型和一个系列.JobSummary是一个模型，JobSummaryList是JobSummary个项目的集合，然后我有一个JobSummarySnapshot模型，其中包含一个JobSummaryList:

JobSummary = Backbone.Model.extend({});

JobSummaryList = Backbone.Collection.extend({
    model: JobSummary
});

JobSummarySnapshot = Backbone.Model.extend({
    url: '/JobSummaryList',

    defaults: {
        pageNumber: 1,
        summaryList: new JobSummaryList()
    }
});

When I call fetch on the JobSummarySnapshot object, it gets everything... Except when I move through the summaryList collection they are all of type object and not JobSummary.

I suppose this makes sense since other than the defaults object, it doesn't know that the summaryList should be of type JobSummaryList. I can go through each item and convert it to a JobSummary object, but I was hoping there was a way to do it without having to do it manually.

Here's my test code (working jsfiddle here):

var returnData = {
    pageNumber: 3,
    summaryList: [
        {
        id: 5,
        name: 'name1'},
    {
        id: 6,
        name: 'name2'}
    ]
}; 

var fakeserver = sinon.fakeServer.create();
fakeserver.respondWith('GET', '/JobSummaryList', [200,
{
    'Content-Type': 'application/json'},
                                JSON.stringify(returnData)]);

var callback = sinon.spy();


var summarySnapshot = new JobSummarySnapshot();
summarySnapshot.bind('change', callback);

summarySnapshot.fetch();
fakeserver.respond();

var theReturnedList = callback.getCall(0).args[0].attributes.summaryList;

_.each(theReturnedList, function(item) {
    console.log('Original Item: ');
    console.log(item instanceof JobSummary); // IS FALSE
    var convertedItem = new JobSummary(item);
    console.log('converted item: ');
    console.log(convertedItem instanceof JobSummary); // IS TRUE
});

更新: 我突然想到，我可以覆盖解析函数并将其设置为这样……我现在有这个了:

JobSummarySnapshot = Backbone.Model.extend({
    url: '/JobSummaryList',

    defaults: {
        pageNumber: 1,
        summaryList: new JobSummaryList()
    },

    parse: function(response) {
        this.set({pageNumber: response.pageNumber});

        var summaryList = new JobSummaryList();
        summaryList.add(response.summaryList);

        this.set({summaryList: summaryList});
    }
});

This works so far. Leaving the question open in case someone has comment on it....