javascript - 用对象填充的外键

Question

我想使用 Backbone 关系在两个模型用户和任务之间建立关系。

两个模型之间的关系如下:

taskModel.creator_id = userModel.id   

---

// TaskModel
var TaskModel = Backbone.RelationalModel.extend({

    relations: [
        {
            type: Backbone.HasOne,
            key: 'creator',
            keySource: 'creator_id',
            relatedModel: Users
        }
    ],

    // some code
});

---

// Task collection
var TaskCollection = Backbone.Collection.extend({

    model: TaskModel,

    // some code

});

---

// User Model
var User = Backbone.RelationalModel.extend({
    // some code
});

---

其实问题出在collection.models，请看附件:

请检查这个 jsfiddle:http://jsfiddle.net/2bsE9/5/

var user = new User(),
    task = new Task(),
    tasks = new Tasks();

task.fetch();
user.fetch();
tasks.fetch();

console.log(user.attributes, task.attributes, tasks.models);

附言:

实际上我正在使用 requireJs 来获取 UserModel，所以我不能在 relatedModel 值中包含引号。

define([
    'models/user',
    'backbone',
    'relationalModel'
], function (User) {
    "use strict";

    var Task = Backbone.RelationalModel.extend({
        relations: [
            {
                type: Backbone.HasOne,
                key: 'creator',
                keySource: 'creator_id',
                relatedModel: User
            }
        ],
    });
);

Answer 1

编辑 2:

http://jsfiddle.net/2bsE9/13/

我更新了 jsfiddle 以反射(reflect)我在下面建议的更改。只要您在任务中调用 toJSON，到达服务器的就是一个 json 对象，其 creator_id 属性设置为用户的实际 id。此处的 keyDestination 是多余的，因为文档指出如果您使用 keySource，它会自动设置。

编辑:

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

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

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

以上三者的组合可能会解决您的问题。

var Task = Backbone.RelationalModel.extend({
    relations: [
        {
            type: Backbone.HasOne,
            // The User object can be accessed under the property 'creator'
            key: 'creator',
            // The User object will be fetched using the value supplied under the property 'creator_id'
            keySource: 'creator_id',
            // The User object will be serialized to the property 'creator_id'
            keyDestination: 'creator_id',
            // Only the '_id' property of the User object will be serialized
            includeInJSON: Backbone.Model.prototype.idAttribute,


            relatedModel: User
        }
    ],
});

文档还指出，您的代码不应使用 keySource 或 keyDestination 指定的属性。该属性不能作为属性访问。

如果解决了您的问题，请尝试并发表评论。

顺便说一句，这是一篇很好的博客文章，它使用端到端的 Backbone 关系。 http://antoviaque.org/docs/tutorials/backbone-relational-tutorial/