如何为Ember数据创建自定义序列化程序 [英] How to create a custom Serializer for Ember data

问题描述

我有一个返回未正确格式化为Ember消费的JSON的API。
而不是这个（希望是什么）：

I have an API that returns JSON that is not properly formatted for Ember's consumption. Instead of this (what ember is expecting):

{ events: [
    { id: 1, title: "Event 1", description: "Learn Ember" },
    { id: 2, title: "Event 2", description: "Learn Ember 2" }
]}

我得到：

{ events: [
    { event: { id: 1, "Event 1", description: "Learn Ember" }},
    { event: { id: 2, "Event 2", description: "Learn Ember 2" }}
]}

所以如果我理解正确，我需要创建一个自定义的Serializer来修改JSON。

So if I understood correctly, I need to create a custom Serializer to modify the JSON.

var store = DS.Store.create({
    adapter: DS.RESTAdapter.create({
        serializer: DS.Serializer.create({
            // which hook should I override??
        })
    })
});

我已经阅读了与DS.Serializer相关的代码注释，但是我不明白实现我想要的...

I've read the code comment related to the DS.Serializer, but I can't understand how to achieve what I want...

我该怎么做？

ps：我的目标是make App.Event.find（） work。目前，我得到未捕获错误：断言失败：您的服务器返回一个带有键0的哈希，但是您没有映射。这就是为什么我需要修复收到的JSON。

ps: My goal is to make App.Event.find() work. Currently, I get Uncaught Error: assertion failed: Your server returned a hash with the key 0 but you have no mapping for it. That's why I need to fix the JSON received.

编辑：现在，这是我的工作原理：

edit: Here's how I made it work, for now:

extractMany: function(loader, json, type, records) {
    var root = this.rootForType(type),
    roots = this.pluralize(root);

    json = reformatJSON(root, roots, json);
    this._super(loader, json, type, records);
  }

推荐答案

我假设回应只包含ID，并且您正在尝试提取它们。

I am assuming that the responses contain the IDs only, and that you are trying to extract them.

您将希望子类 DS.JSONSerializer ，它提供了处理JSON有效载荷的基本行为。特别是，您将要覆盖 extractHasMany 钩子：

You will want to subclass DS.JSONSerializer, which supplies the basic behavior for dealing with JSON payloads. In particular, you will want to override the extractHasMany hook:

// elsewhere in your file
function singularize(key) {
  // remove the trailing `s`. You might want to store a hash of
  // plural->singular if you deal with names that don't follow
  // this pattern
  return key.substr(0, key.length - 1);
}

DS.JSONSerializer.extend({
  extractHasMany: function(type, hash, key) {
    return hash[key][singularize(key)].id;
  }
})

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