Question

创建新集合时（选择）我想在其上设置一个属性（例如：_question），该属性链接回包含的模型（MultipleChoiceQuestion）

Answer 1

这花了我相当多的时间来弄清楚，所以如果将来有人有这个问题......这就是我最后编写的代码。

我发现，与Model不同，Collection的initialize（）函数接受2个参数。第一个是models（可以使用初始化集合的模型列表）。第二个是options（你想要的）。有一段时间我的收藏开始时有1个模型，我无法找出原因。事实证明我将options传递到models字段。

包含模型：

m.MultipleChoiceQuestion = Backbone.Model.extend({
    initialize: function(){
        //NULL as first parameter because we don't want models
        this.choices = new c.Choices(null, { 
            _question: this //this is referring to current question
        }); //choices Collection is this
    }
});

收集

c.Choices = Backbone.Collection.extend({
    initialize: function(models, options){
        this._question = options._question;
    },
    model: m.Choice
});

Answer 2

我实际上发现，尽管我的第一个答案在技术上有效，但是有一个插件可以在模型中存储集合（并创建适当的One-＆gt; Many，One-＆gt; One和Many-＆gt; One relationship

https://github.com/PaulUithol/Backbone-relational

使用该插件将父问题存储为ATTRIBUTE

m.MultipleChoiceQuestion = Backbone.RelationalModel.extend({
    relations: [{
        type: Backbone.HasMany,
        key: 'choices', //says to store the collection in the choices attribute
        relatedModel: m.Choice, //knows we are talking about the choices models
        includeInJSON: true, //when we do toJSON() on the Question we want to show serialize the choices fully
        reverseRelation: {
            key: 'question', //in the CHOICE object there will be an attribute called question which contains a reference to the question 
            includeInJSON: false //when we do .toJSON on a CHOICE we don't want to show the question object (or maybe we want to show the ID property in which case we set it to "id")
        }
    }],
    coolFunction: function () {
        this.get('choices').each(function(choice){
            choice.doSomethingChoicey();
        });
    }
});

所以现在如果我们在选择模型中，我们可以完全引用父问题中的任何内容：

m.Choice = m.RelationalModel.extend({
    coolFunction: function(){
        this.get('question').doSomemethingQuestiony();
        var question_numer = this.get('question').get('question_number');
    }
});

如何在Backbone.js中的模型中存储对Collection的引用？

2 个答案: