我在tag和payment模型之间定义了一个多对多关系，如下所示。

//models/tag.js
import Model, { attr, hasMany } from '@ember-data/model';

export default Model.extend({
  name: attr('string'),
  backgroundColour: attr('string'),
  textColour: attr('string'),
  payments: hasMany('payment')
});

// models/payment.js
import Model, { attr, hasMany } from '@ember-data/model';

export default Model.extend({
  date: attr('date'),
  amount: attr('number'),
  paymentId: attr('string'),
  tags: hasMany('tag'),
});

默认情况下，当我向付款添加标签时，付款的id被用作关系的键。我的目标是让Ember数据使用paymentId属性作为此关系的键。
下面的代码片段显示了我正在加载的数据的结构，其中一个标记引用了paymentId属性的付款。

// Example tag
    {
      "id": "25",
      "name": "Groceries",
      "backgroundColour": "31b04b",
      "textColour": "ffffff",
      "payments": ["20190121201902210"] // References paymentId rather than id
    },

    // Example payment
    {
      "id": "1"
      "date": "2019-01-27T22:00:00.000Z",
      "amount": 1644.44,
      "paymentId": "20190121201902210",
      "tags": ["25"]
    }

我试着自定义支付序列化程序如下，

// serializers/payment.js

import ApplicationSerializer from './application';

export default ApplicationSerializer.extend({
  keyForRelationship(key, _relationship) {
    if (key === 'payments') {
      return 'paymentId';
    }
  },
});

但是，当加载模型时，我得到以下错误：Assertion Failed: All elements of a hasMany relationship must be instances of Model, you passed [ "20190121201902210" ] .
如何让Ember数据在查找相关付款时使用paymentId而不是id？