Ember-data：反序列化嵌入式模型

Question

我真的不明白...

我有以下代码：

App.Instance = DS.Model.extend({
  hash: DS.attr('string'),
  users: DS.hasMany('user', { embedded: 'always' })
});

App.User = DS.Model.extend({
  name: DS.attr('string'),
  color: DS.attr('string'),
  lat: DS.attr('number'),
  lng: DS.attr('number'),
  instance: DS.belongsTo('instance')
});

App.InstanceSerializer = DS.RESTSerializer.extend(DS.EmbeddedRecordsMixin, {
  attrs: {
    users: { embedded: 'always' }
  }
});

像这样的例子：

var instance = {
  hash: "68309966ec7fbaac",
  id: "54b4518fcbe12d5160771ebe",
  users: [{
    color: "#9E463C",
    id: "78b662bc56169a96",
    lat: 36.5299487,
    lng: -6.2921774,
    name: "User 1"
  },{
    color: "#9E463C",
    id: "78b662bc56169a96",
    lat: 36.5299487,
    lng: -6.2921774,
    name: "User 2"
  }]
}

但是当我想要 store.push('instance', instance); 时，我收到：

Uncaught Error: Assertion Failed: Ember Data expected a number or string to represent the record(s) in the users relationship instead it found an object. If this is a polymorphic relationship please specify a type key. If this is an embedded relationship please include the DS.EmbeddedRecordsMixin and specify the users property in your serializer's attrs

哪里错了？

从所有那些总是使用不同策略的资源中读取：

http://emberjs.com/api/data/classes/DS.EmbeddedRecordsMixin.html
How to make embedded hasMany relationships work with ember data
Ember-data Serialize/Deserialize embedded records on 3rd level

非常感谢

Answer 1

来自这篇文章：http://mozmonkey.com/2013/12/loading-json-with-embedded-records-into-ember-data-1-0-0-beta/ ember 想要像这样侧载您的数据：

var data = {
  instance: {
    hash: "68309966ec7fbaac",
    id: "54b4518fcbe12d5160771ebe",
    users: ["78b662bc56169a96", "78b662bc56169a97"]
  },
  users: [{
    color: "#9E463C",
    id: "78b662bc56169a96",
    lat: 36.5299487,
    lng: -6.2921774,
    name: "User 1"
  },{
    color: "#9E463C",
    id: "78b662bc56169a96",
    lat: 36.5299487,
    lng: -6.2921774,
    name: "User 2"
  }]
}

这里很容易做到：

for (var i=0; i < data.users.length; i++) {
  store.push('user', data.users[i]);
}
store.push('instance', data.instance);

Answer 2

在已序列化的文件夹中创建序列化。序列化的名称与您的模型相同。

import DS from 'ember-data';

export default DS.RESTSerializer.extend(DS.EmbeddedRecordsMixin, {
    hasEmbeddedAlwaysOption: function(attr) {
        var option = this.attrsOption(attr);

        if (typeof(option) === 'undefined') {
            return true;
        } else if (option.embedded === false) {
            return false;
        }

        return this._super.apply(this, arguments);
    },

    noSerializeOptionSpecified: function(attr) {
        var option = this.attrsOption(attr);

        if (typeof(option) === 'undefined') {
            return false;
        } else if (option.embedded === false && !!option.serialize) {
            return true;
        }

        return this._super.apply(this, arguments);
    }
});

当对象内部有对象时会发生这种情况。如果您不想为每个包含对象内部对象的模型创建一个像这样的 class，请将此代码复制到 application.js inside serializers 文件夹中。

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