上的toJSON＃Backbone.Collection哪里？ [英] toJSON on Backbone.Collection#where?

问题描述

我不知道为什么，但我不能得到这个工作。

I'm not sure why, but I can't get this to work.

var friends = new Backbone.Collection([
  {name: "Athos",      job: "Musketeer"},
  {name: "Porthos",    job: "Musketeer"},
  {name: "Aramis",     job: "Musketeer"},
  {name: "d'Artagnan", job: "Guard"},
]);

friends.where({job: "Musketeer"}).toJSON()

我收到未捕获类型错误：对象的翻译：没有法的toJSON

什么我是我做错了，我怎么转换我收集过滤成JSON？

What I'm I doing wrong and how do I convert my filtered collection into JSON?

推荐答案

什么 Underscore.where 方法返回的是一个阵列不是 Backbone.Collection 所以它有没有定义的的toJSON 方法。

What the Underscore.where method returns is an Array not a Backbone.Collection so it has not the toJSON method defined.

所以，你可以做两件事情：

So you can make two things:

var result = friends.where({job: "Musketeer"});
_.map( result, function( model ){ return model.toJSON(); } );

的jsfiddle code

var Friends = Backbone.Collection.extend({
    search: function( opts ){
        var result = this.where( opts );
        var resultCollection = new Friends( result );

        return resultCollection;
    }
});

var myFriends = new Friends([
  {name: "Athos",      job: "Musketeer"},
  {name: "Porthos",    job: "Musketeer"},
  {name: "Aramis",     job: "Musketeer"},
  {name: "d'Artagnan", job: "Guard"},
]);

myFriends.search({ job: "Musketeer" }).toJSON();​

的jsfiddle code

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