ember 数据序列化器数据映射 [英] ember data serializer data mapping

问题描述

我正在使用 ember &ember-data 尝试使用来自服务器的 json 提要.这是我的代码:

I'm using ember & ember-data to try and consume a json feed from the server. Here is my code:

App = Ember.Application.create();

DS.RESTAdapter.configure(
    "plurals", {
        category: 'categories'
    }
);

App.Store = DS.Store.extend({
    revision: 12,
    adapter: DS.RESTAdapter.create({
        url: 'app'
    })
});

App.Router.map(function(){
    this.resource('categories');
});

App.CategoriesRoute = Ember.Route.extend({
    model: function() {
        return App.Category.find();
    }
});

var attr = DS.attr;

App.Category = DS.Model.extend({
    name: attr('string')
});

现在这适用于测试服务器.使用以下 JSON

Now this works fine with a testing server. Using the following JSON

{
    "categories":[
        {
            "name":"Beef",
            "id":1
        },
        {
            "name":"Pork",
            "id":2
        }
    ]
}

但是在生产中，服务器提供以下 json:

However in production the server provide the following json:

{
    "success":true,
    "message":"Request successful",
    "total":2,
    "data":[
        {
            "name":"Beef",
            "id":1
        },
        {
            "name":"Pork",
            "id":2
        }
    ]
}

我一生都无法弄清楚如何使用序列化程序来使用实时 json.任何帮助，将不胜感激.提前致谢.

I can't for the life of me work out how to use the serializer to consume the live json. Any help would be appreciated. Thanks in advance.

更新:

此后我尝试编写序列化程序，但它似乎不起作用...

I've since tried to write the serializer but it doesn't appear to be working...

见下文

App.Store = DS.Store.extend({
    revision: 12,
    adapter: DS.RESTAdapter.create({
        url: 'app',
        serializer: DS.RESTSerializer.extend({
            extract: function(loader, json, type, record) {
                var root = 'data';
                this.sideload(loader, type, json, root);
                this.extractMeta(loader, type, json);
                if (json[root]) {
                    if (record) { loader.updateId(record, json[root]); }
                    this.extractRecordRepresentation(loader, type, json[root]);
                }
            }
        })
    })
});

现在产生这个错误 Uncaught Error: assertion failed: 你的服务器返回了一个带有关键数据的哈希值，但你没有映射它

推荐答案

您有 2 个选择

• 使您的服务器兼容，并让它按照 ember 数据的预期返回 json，
• 编写您自己的适配器/串行器来支持这种格式.

更新:编写自己的序列化程序更新 2:删除未使用的函数

UPDATE: write your own serializer UPDATE 2: get rid of unused functions

https://github.com/emberjs/data/blob/master/packages/ember-data/lib/serializers/json_serializer.js#L196

您可以从 DS.RESTSerializer 继承并使用此代码更改 extract

You can inherit from the DS.RESTSerializer and change extract with this code

  extract: function(loader, json, type, record) {
    var root = 'data';

    if (json[root]) {
      if (record) { loader.updateId(record, json[root]); }
      this.extractRecordRepresentation(loader, type, json[root]);
    }
  }

这里假设请求的内容总是在你的 json 的 data 键下.

This assumes that the content of request will always be under the data key of your json.

这篇关于ember 数据序列化器数据映射的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！