使用backbone.js处理belongs_to关系

var User = Backbone.Model.extend({
  defaults: {
    name: '',
    email: ''
  },
  initialize: function() {
    this.posts = new Posts();
  }
});

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

var Posts = Backbone.Collection.extend({
  model: Post
});

var user = new User({ name: 'John', email: 'john@example.com' });
var post1 = new Post({ title: 'Post 1', content: 'This is the first post.' });
var post2 = new Post({ title: 'Post 2', content: 'This is the second post.' });

user.posts.add(post1);
user.posts.add(post2);

var userPosts = user.posts.toJSON();