我要如何插入一个模型转换为Backbone.js的集合在一个特定的指数？ [英] How do I insert a model into a backbone.js collection in a specific index?

问题描述

我需要在位置Collection.length-2插入一个模型到一个集合。集合中的最后一个模型应该永远留在集合中的最后一个模型。

I need to insert a model into a Collection at position Collection.length-2. The last model in the collection should always stay the last model in the collection.

我试过到目前为止：

我加一页模式向集页，然后试图通过改变其周围序列交换他们：

I added one "page" model to the Collection "Pages" and then tried to swap them around by changing their sequence:

var insertedpage = Pages.at(Pages.length-1);
var lastpage = Pages.at(Pages.length-2);
insertedpage.set({sequence: Pages.length-1});
lastpage.set({sequence: Pages.length});

我也试图删除的最后一页，然后添加一个新的页面，然后添加最后一页回。

I also tried to remove the last page, then add a new page and then add the last page back in.

var lastpage =  Pages.pop();
Pages.add({example1: example2});
Pages.push(lastpage);

这些都不奏效。新添加的页面仍显示在收藏作为最后的模型。我需要调用某种秩序的功能在此之后？

neither of these worked. The newly added page still appears as last model in the Collection. Do I need to call some kind of order function after this?

推荐答案

对不起，我简要回答（没有时间做出反应），但看看定义一个比较器功能。

Sorry for the brief answer (don't have time to respond), but look at defining a comparator function.

http://documentcloud.github.com/backbone/#Collection-comparator

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