How to get nested object in ember?

Ember Data
1

Hi. I create two models:

Organization:

import DS from 'ember-data';

export default DS.Model.extend({
    name: DS.attr('string'),
    tax_id: DS.attr('string'),
    address: DS.belongsTo('address'),
    created_at: DS.attr('isodate')
});

Address:

import DS from 'ember-data';

export default DS.Model.extend({
  line1: DS.attr('string'),
  line2: DS.attr('string'),
  city: DS.attr('string'),
  post_code: DS.attr('string'),
  country_code: DS.attr('string'),
  organization: DS.belongsTo('address')
});

One serializers Organization:

import DS from 'ember-data';

export default DS.RESTSerializer.extend({
  attrs: {
    address: { embedded: 'always' }
  }
});

And I want view it in table but I get errors:

Error while processing route: organizations.index Assertion Failed: You must include an ‘id’ for undefined in an object passed to ‘push’ Error: Assertion Failed: You must include an ‘id’ for undefined in an object passed to ‘push’ at new Error (native) at Error.EmberError (http://localhost:4200/assets/vendor.js:25883:21) at assert (http://localhost:4200/assets/vendor.js:15784:13) at Object.assert (http://localhost:4200/assets/vendor.js:23185:34) at ember$data$lib$system$store$$Service.extend._pushInternalModel (http://localhost:4200/assets/vendor.js:130163:15) at ember$data$lib$system$store$$Service.extend.push (http://localhost:4200/assets/vendor.js:130149:34) at http://localhost:4200/assets/vendor.js:125034:17 at Object.Backburner.run (http://localhost:4200/assets/vendor.js:10855:25) at ember$data$lib$system$store$$Service.extend._adapterRun (http://localhost:4200/assets/vendor.js:130376:33) at http://localhost:4200/assets/vendor.js:125031:15

Error: Assertion Failed: You must include an ‘id’ for undefined in an object passed to ‘push’ at new Error (native) at Error.EmberError (http://localhost:4200/assets/vendor.js:25883:21) at assert (http://localhost:4200/assets/vendor.js:15784:13) at Object.assert (http://localhost:4200/assets/vendor.js:23185:34) at ember$data$lib$system$store$$Service.extend._pushInternalModel (http://localhost:4200/assets/vendor.js:130163:15) at ember$data$lib$system$store$$Service.extend.push (http://localhost:4200/assets/vendor.js:130149:34) at http://localhost:4200/assets/vendor.js:125034:17 at Object.Backburner.run (http://localhost:4200/assets/vendor.js:10855:25) at ember$data$lib$system$store$$Service.extend._adapterRun (http://localhost:4200/assets/vendor.js:130376:33) at http://localhost:4200/assets/vendor.js:125031:15

How I can fix errors and view data?