Ember 数据一对多关系无效

Question

我是 ember 的新手，但我想知道这是否是我的逻辑问题，或者 ember.

中是否存在某些功能不正常的问题

当我尝试 model.get('profile') 我得到空值。

我已经能够像这样检索配置文件模型： this.store.find('profile', 17); 我还可以向位置模型添加一个 profile_id 属性，然后使用它

var location = this.modelFor('location');
var profile =  this.store.find('profile', 17);

但是根据我在文档中找到的内容，我应该能够在位置对象上使用 .get('profile') 来获取其配置文件。

奇怪的是我的附件关系（位置有很多附件）工作得很好。

我错过了什么吗？我做错了什么导致这段关系失败？

我有三个模型：

位置->

export default DS.Model.extend({
  image: DS.attr('string'),
  latitude:DS.attr('string'),
  longitude:DS.attr('string'),
  outlets:DS.attr('string'),
  parking:DS.attr('string'),
  internet:DS.attr('string'),
  credit_cards:DS.attr('string'),
  share_url:DS.attr('string'),
  roaster:DS.attr('string'),
  about:DS.attr('string'),
  name: DS.attr('string'),
  address: DS.attr('string'),
  images: DS.attr('string'),
  attachments: DS.hasMany('attachment'),
  profile: DS.belongsTo('profile'),
  curator_image: DS.attr('string'),
  curator_about: DS.attr('string'),
  curator_name: DS.attr('string'),
  style_image_url: function(){
    return "background-image:url('" + this.get("image") + "')";
  }.property("image"),
  style_profile_image_url: function(){
    return "background-image:url('" + this.get("curator_image") + "')";
  }.property("curator_image"),
});

附件 ->

export default DS.Model.extend({
    location: DS.belongsTo('location'),
    image:DS.attr('string')
});

个人资料 ->

export default DS.Model.extend({
    location: DS.hasMany('location'),
    name:DS.attr('string'),
    about:DS.attr('string'),
    image:DS.attr('string'),
});

这是来自服务器的示例响应： locations.json

{
    attachments: [
    {
        id: 254,
        image: "https://dripper-dev.s3-us-west-1.amazonaws.com/uploads/large_9443c014-69e1-4616-943d-e627a47f8306.jpg?AWSAccessKeyId=AKIAJPYWBHET4VVL5NUA&Signature=nD3YMiuFiHtpuTPop77Q%2BS6N9HM%3D&Expires=1427847353"
    },
    {
        id: 250,
        image: "https://dripper-dev.s3-us-west-1.amazonaws.com/uploads/large_3e562933-5ce2-4f91-bb6f-6fe6883e0463.jpg?AWSAccessKeyId=AKIAJPYWBHET4VVL5NUA&Signature=ESbhuHNjx9kD63gJY3UVRsHs2B8%3D&Expires=1427847353"
    }],
    locations: [
    {
        id: 12,
        latitude: "45.550346",
        longitude: "-122.666584",
        address: "3808 North Williams Avenue, Portland, OR 97212, USA",
        outlets_text: "Yes",
        internet_text: "No",
        roaster: "Ristretto Roasters",
        parking_text: "Yes",
        credit_cards: true,
        image: "https://dripper-dev.s3-us-west-1.amazonaws.com/uploads/medium_9b676fc6-814c-4f5f-a03b-5a5f650fc7aa.jpg?AWSAccessKeyId=AKIAJPYWBHET4VVL5NUA&Signature=w5pSN5iJbtlWfiFo2UMcJMN6pAs%3D&Expires=1427847347",
        name: "Ristretto",
        twitter_username: null,
        curator_image: "https://dripper-dev.s3-us-west-1.amazonaws.com/uploads/basic_uploader/Profile/9d77af52-033b-4bd9-8cb4-8b961f366392.jpg?AWSAccessKeyId=AKIAJPYWBHET4VVL5NUA&Signature=YsgxmH%2B5wmlOpVSoti5kn0DozKQ%3D&Expires=1427847347",
        curator_name: "Jack White",
        curator_about: "this is a test this is a test this is a test this is a test this is a test this is a test this is a test this is a test this is a test this is a test this is a test this is a test this is a test ",
        profile_id: 17,
        attachment_ids: [
            30
        ]
    },
    ...

路线： /routes/location.js

export default Ember.Route.extend({
    model: function(params) {
        return this.store.find('location', params.location_id);
    }
});

/routes/location/指数

export default Ember.Route.extend({
    model: function() {
        return this.modelFor('location').get('profile');
    }
});

更新：我能够通过将 json 更改为：

来获取配置文件模型

{
    attachments: [],
    locations: [
    {
        id: 12,
        latitude: "45.550346",
        longitude: "-122.666584",
        address: "3808 North Williams Avenue, Portland, OR 97212, USA",
        outlets_text: "Yes",
        internet_text: "No",
        roaster: "Ristretto Roasters",
        parking_text: "Yes",
        credit_cards: true,
        image: "https://dripper-dev.s3-us-west-1.amazonaws.com/uploads/medium_9b676fc6-814c-4f5f-a03b-5a5f650fc7aa.jpg?AWSAccessKeyId=AKIAJPYWBHET4VVL5NUA&Signature=bhPpdV6bxroZZ0Lfk2jN6aPht7A%3D&Expires=1427916453",
        name: "Ristretto",
        twitter_username: null,
        curator_image: "https://dripper-dev.s3-us-west-1.amazonaws.com/uploads/basic_uploader/Profile/9d77af52-033b-4bd9-8cb4-8b961f366392.jpg?AWSAccessKeyId=AKIAJPYWBHET4VVL5NUA&Signature=K1VuT3Oe8ncTdX%2FA9H7s4XJcQ84%3D&Expires=1427916453",
        curator_name: "Jack White",
        curator_about: "this is a test this is a test this is a test this is a test this is a test this is a test this is a test this is a test this is a test this is a test this is a test this is a test this is a test ",
        profile_id: 17,
        profile: {
            id: 17,
            name: "Jack White",
            about: "this is a test this is a test this is a test this is a test this is a test this is a test this is a test this is a test this is a test this is a test this is a test this is a test this is a test ",
            action_url: null,
            action_caption: null,
            published: null,
            image: {
                url: "https://dripper-dev.s3-us-west-1.amazonaws.com/uploads/basic_uploader/Profile/9d77af52-033b-4bd9-8cb4-8b961f366392.jpg?AWSAccessKeyId=AKIAJPYWBHET4VVL5NUA&Signature=E%2BgWHlMRcIXDeMOTmLhfdU8YyTc%3D&Expires=1427916459"
            },
            user_id: 9,
            created_at: "2015-03-24T20:07:31.043Z",
            updated_at: "2015-03-24T20:09:01.518Z"
        },
        attachment_ids: [
        30
        ]
    }, ...

在通往 window.loc 的路线中保存我的位置对象，然后在浏览器控制台中检查： loc.get('profile').get('name') returns "Jack White" 这是正确的，但我不清楚为什么这个改变会产生影响。侧面加载（放置相关对象的 ID 并包括这些对象的顶级数组）是否仅适用于 ember 数据中的一对多关系？

欢迎任何输入，我对 ember 数据还是个新手。

Answer 1

我在这里可能有点傻，但是您的 Location 模型没有 Profile 字段 - 大概是因为它属于 Profile。但是，如果没有该字段，您将无法在 Location.

上执行 .get('profile')

Answer 2

您的 locations.json 中没有侧面加载的配置文件对象，就像附件一样。它应该看起来更像：

{
   locations: [{
     id: 12,
     ...
     profile_id: 17,
     attachment_ids: [...]
   }],
   attachments: [...],
   profiles: [...]    /* for multiple profiles, or*/
   profile: {...}     /* for a single side-loaded model */
}
...

否则，如果您想异步加载 profile 模型，您需要在 location 模型中声明如下：

profile: DS.belongsTo('profile', {
  async: true
}

Answer 3

我发现解决方案是在 json 中将 profile_id: xx 重命名为 profile: xx。我假设 model_id 是记录属于关系的正确方法，但结果 ember 只需要模型名称。希望这对以后的人有帮助！

Ember 数据一对多关系无效

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