New Twiddle

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  actions:{
  	deletePassport(){
    	this.get('model').set('passport',null);
    },
    deletePet(pet){
    	this.get('model.pets').removeObject(pet);
    },
    undoChanges(){
    	this.get('model').undoAll();
    }
  }
});

models.passport.js

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

export default Model.extend({
  idNumber: attr('string'),
  user: belongsTo('user')
});

models.pet.js

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

export default Model.extend({
  petType: attr('string'),
  user: belongsTo('user')
});

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('string'),
  passport: belongsTo('passport'),
  pets: hasMany('pet')
});

routes.application.js

import Ember from 'ember';
import TimeMachine from 'ember-time-machine';


export default Ember.Route.extend({
  model(){
  	let user = this.store.createRecord('user',{name:"Louis"});
  	let passport = this.store.createRecord('passport',{idNumber:"1234"});
  	let pet1 = this.store.createRecord('pet',{petType:"dog"});
  	let pet2 = this.store.createRecord('pet',{petType:"cat"});
    user.set('passport',passport);
    user.get('pets').pushObject(pet1);
    user.get('pets').pushObject(pet2);
    return TimeMachine.Object.create({ content: user });
  }
});

templates.application.hbs

<h1>User</h1>
name: {{model.name}}
<br>
is there a passport? {{if model.passport "yes" "no"}}
<br>
passportId: {{model.passport.idNumber}} <button {{action "deletePassport"}}>x</button>
<br>
pets:<br>
{{#each model.pets as |pet|}}
{{pet.petType}}<button {{action "deletePet" pet}}>x</button><br>
{{/each}}
<button {{action "undoChanges"}}>undo</button>

twiddle.json

{
  "version": "0.11.0",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.10.2",
    "ember-data": "2.11.0",
    "ember-template-compiler": "2.10.2",
    "ember-testing": "2.10.2"
  },
  "addons": {
  	"ember-time-machine": "latest"
  }
}