New Twiddle

controllers.application.js

import Ember from 'ember';
import Changeset from 'ember-changeset';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
  
  actions: {
    save(){
     	const changeset = new Changeset(this.model.post);
      
      changeset.save();
    }
  }
});

models.post.js

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

export default Model.extend({
  title: attr(),
  
  user: belongsTo()
});

models.user.js

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

export default Model.extend({
  name: attr(),
  
  post: belongsTo()
});

routes.application.js

import Ember from 'ember';

export default Ember.Route.extend({
  beforeModel(){
   	const user = this.store.createRecord('user', { name: "Hello World" });
    const post = this.store.createRecord('post', { title: "My Post", user });
  },
  
  model(){
   	return this.store.peekAll('user').objectAt(0); 
  }
});

templates.application.hbs

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

<button {{action "save"}}>Save</button>
<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",
    "ember-changeset": "2.0.0"
  }
}