Ember Data Relationships

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
  
	
});

models.group.js

import Model from 'ember-data/model';
import attr from 'ember-data/attr';
import { belongsTo, hasMany } from 'ember-data/relationships';

export default Model.extend({
  groupName: attr(),
  nodes: hasMany('node'),
});

models.node.js

import Model from 'ember-data/model';
import attr from 'ember-data/attr';
import { belongsTo, hasMany } from 'ember-data/relationships';

export default Model.extend({
  nodeName: attr(),
  group: belongsTo('group'),
});

routes.application.js

import Ember from 'ember';
import { inject as service } from '@ember/service';

export default Ember.Route.extend({
  store: service(),
  
  async model() {
  	let group = this.store.createRecord('group', { groupName: "FooGroup" });
    let node = this.store.createRecord('node', { nodeName: "BarNode" });
    
    group.nodes.pushObject(node);
    
    console.log(group, node.get('group.groupName'))
    return group;
  }
});

templates.application.hbs

<h1>Welcome to {{appName}} {{model}}</h1>
<br>
<br>
{{outlet}}
<br>
<br>

twiddle.json

{
  "version": "0.15.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.js",
    "ember": "3.4.3",
    "ember-template-compiler": "3.4.3",
    "ember-testing": "3.4.3"
  },
  "addons": {
    "ember-data": "3.4.2"
  }
}