Backbone中Collection的基础知识

1 定义Collection，定义Collection时通常需要指定其扩展的Model

var Book = Backbone.Model.extend({
defaults: {
title: '',
author: ''
}
});

var BookShelf = Backbone.Collection.extend({
model: Book
});

2 向Collection中添加model

bookShelf.add(book);
bookShelf.add([book-array]);

3 从Collection中移除model

bookShelf.remove(book);
bookShelf.remove([book-array]);

4 获取Collection中的model

bookShelf.get(3); //id

5 事件监听

BookShelf.on('add', function(book){});

BookShelf.on('change:title', function(book){});

6 设置Collection

BookShelf.set([book-array]);

BookShelf.reset([book-array]);
BookShelf.reset();// 清空Collection，触发reset事件，而不触发add或remove事件

7 更新Collection

BookShelf.update([book-array]);

8 Underscore提供的方法

BookShelf.forEach(function(book){});

BookShelf.sortBy(function(book){
return book.get('title').toLowerCase();
});

BookShelf.map(function(book){});

BookShelf.max(function(book){
return book.id;
}).id;

BookShelf.min(function(book){
return book.id;
}).id;

BookShelf.pluck('title');  //返回Collection中各个model的title属性，形成数组

Bookshelf.any(function(book){
return book.id === 3;
});

Bookshelf.some(function(book){
return book.id === 3;
});

BookShelf.size();
//相当于
BookShelf.length;

BookShelf.isEmpty()

BookShelf.groupBy('key');

book.pick('key');

book.omit('key');

book.keys();

book.values();

book.pairs();

book.invert();

id, cid, idAttribute