Javascript inception models.js

我想创建（请坐）一组模型。这些模型应该包含其他集合。女巫有名字，颜色和一系列的费用

以下是我的3个对象：

//model : Expense
var Expense = Backbone.Model.extend({
    defaults: {
        date: '',
        cost: 0,
        comment: ''
    },
    initialize: function () {
        console.log('expense : created');
    }
});
//model : Category
var Category = Backbone.Model.extend({
    defaults: {
        name: '',
        color: '#333',
        expenses: Backbone.Collection.extend({
            model: Expense
        })
    },
    initialize: function () {
        console.log('expense : created');
    }
});
//model : Wallet
var Wallet = Backbone.Model.extend({
    defaults: {
        categories: Backbone.Collection.extend({
            model: Category
        })
    },
    initialize: function () {
        console.log('wallet : created');
    }
});

我对嵌套模型进行了2天的研究，但我真的找不到一种方法：

• 在我的钱包上添加类别
• 在我的类别中添加费用
• 修改它们

你觉得这真的能帮我吗？它们看起来很重

我希望我的回答不要太傻，我是一个有主心骨的新手，要想进入这个行业并不容易

问候,，

---

Tom

如果您不想为嵌套模型使用主干插件，您可以这样做：

//model : Expense
var Expense = Backbone.Model.extend({
    defaults: {
        date: '',
        cost: 0,
        comment: ''
    },
    initialize: function () {
        console.log('expense : created');
    }
});

//collection : Expenses
var Expenses = Backbone.Collection.extend({
    model: Expense
});

//model : Category
var Category = Backbone.Model.extend({
  defaults: {
    name: '',
    color: '#333'
  },
  initialize: function () {
    this._ensureExpenses();
    console.log('expense : created');
  },
  parse: function(data){
    if(data.expenses){
      this._ensureExpenses();
      this.expenses.set(data.expenses, {parse: true});
    }
    return _.omit(data, 'expenses'); 
  },    
  toJSON: function(){
    return _.extend(_.clone(this.attributes), {
      expenses: this.expenses.toJSON()
    });
  },
  _ensureExpenses: function(){
    this.expenses = this.expenses || new Expenses();
  }
});

//collection : Categories
var Categories = Backbone.Collection.extend({
  model: Category
});

//model : Wallet
var Wallet = Backbone.Model.extend({
  initialize: function () { 
    this._ensureCategories();
    console.log('wallet : created');
  },
  parse: function(data){
    if(data.categories){
      this._ensureCategories();
      this.categories.set(data.categories, {parse: true});
    }
    return _.omit(data, 'categories'); 
  },
  toJSON: function(){
    return _.extend(_.clone(this.attributes), {
      categories: this.categories.toJSON()
    });
  },
  _ensureCategories: function(){
    this.categories = this.categories || new Categories();
  }
});

如果您不需要将wallet序列化为纯JS对象或JSON，您可以删除toJSON方法

---

你可以在这里测试：

哇，这太棒了！我现在会进入代码来理解它，但它看起来很完美！要添加费用或类别，我应该使用get/set还是像在vanilla js（myWallet.Expenses.push（{…}））中那样做？您可以使用collection.add（）向collection添加新模型：

myWallet.categories.first（）.Expenses.add（{date:'24/12/2013'，cost:4}）