error.txt

Error: Assertion Failed: Ember Data expected a number or string to represent the record(s) in the `role` 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 `role` property in your serializer's attrs object.
    at new Error (native)
    at Error.EmberError (http://maldenma.localhost:3000/dashboard/assets/vendor.js:22059:21)
    at Object.Ember.default.assert (http://maldenma.localhost:3000/dashboard/assets/vendor.js:15394:13)
    at ember$data$lib$system$store$$deserializeRecordId (http://maldenma.localhost:3000/dashboard/assets/vendor.js:76334:15)
    at http://maldenma.localhost:3000/dashboard/assets/vendor.js:76312:11
    at http://maldenma.localhost:3000/dashboard/assets/vendor.js:78222:20
    at Map.forEach.cb (http://maldenma.localhost:3000/dashboard/assets/vendor.js:23605:11)
    at OrderedSet.forEach (http://maldenma.localhost:3000/dashboard/assets/vendor.js:23398:11)
    at Map.forEach (http://maldenma.localhost:3000/dashboard/assets/vendor.js:23609:18)
    at Function.ember$data$lib$system$model$$default.reopenClass.eachRelationship (http://maldenma.localhost:3000/dashboard/assets/vendor.js:78221:83)

models_user.js

import Ember from 'ember';
import DS from 'ember-data';

const computed = Ember.computed;
const attr = DS.attr;
const belongsTo = DS.belongsTo;

export default DS.Model.extend({
  name: attr('string'),
  email: attr('string'),
  status: attr('string'),
  superuser: attr('boolean'),
  role: belongsTo('role', {
    async: true
  }),

  isActivated: computed.equal('status', 'activated'),
  isRequested: computed.equal('status', 'requested'),
});

serializers_user.js

import DS from 'ember-data';

export default DS.RESTSerializer.extend(DS.EmbeddedRecordsMixin, {
  attrs: {
    role: {
      serialize: 'id',
      deserialize: 'records'
    }
  }
});