Ember-data access nested object

Hello, I have ben making some website. I just 2 route contact and notes

I have rails api below.

api_v1_contact_notes GET    /api/v1/contacts/:contact_id/notes(.:format)     api/v1/notes#index
                     POST   /api/v1/contacts/:contact_id/notes(.:format)     api/v1/notes#create
 api_v1_contact_note GET    /api/v1/contacts/:contact_id/notes/:id(.:format) api/v1/notes#show
                     PATCH  /api/v1/contacts/:contact_id/notes/:id(.:format) api/v1/notes#update
                     PUT    /api/v1/contacts/:contact_id/notes/:id(.:format) api/v1/notes#update
                     DELETE /api/v1/contacts/:contact_id/notes/:id(.:format) api/v1/notes#destroy
     api_v1_contacts GET    /api/v1/contacts(.:format)                       api/v1/contacts#index
                     POST   /api/v1/contacts(.:format)                       api/v1/contacts#create
      api_v1_contact GET    /api/v1/contacts/:id(.:format)                   api/v1/contacts#show
                     PATCH  /api/v1/contacts/:id(.:format)                   api/v1/contacts#update
                     PUT    /api/v1/contacts/:id(.:format)                   api/v1/contacts#update
                     DELETE /api/v1/contacts/:id(.:format)                   api/v1/contacts#destroy

Accessing api is success fully.

First I create one route contact and model

model Contact

import DS from 'ember-data';

export default DS.Model.extend({
  name: DS.attr('string'),
  email: DS.attr('string'),
  description: DS.attr('string'),
  notes: DS.hasMany('note', {async: true})

model Note

import DS from 'ember-data';

export default DS.Model.extend({
  content: DS.attr('string'),
  contact: DS.belongsTo('contact', {async: true})

just I add this.store.findAll('contact'); for access all of contact.

so I represent inside one of contact.

contacts/show route is contacts/:contact_id

Problem is here.

I want to access backend api api/v1/contacts/1/notes that I created that before I use.

I tried get notes of contact id ‘1’

my contacts/show.js I get contact object have id 1

var contact = this.store.findRecord('contact', params.contact_id);

contact.notes.length is 0 but I access http://localhost:3000/api/v1/contacts/1/notes return 3 notes.

how I get notes inside contact?