Push Polymorphic

controllers.application.js

import Ember from 'ember';

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

models.big-hat.js

import Hat from "./hat";

export default Hat.extend({
});

models.hat.js

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

export default Model.extend({
  type: attr('string'),
  person: belongsTo('person', { async: false, inverse: 'hats' })
});

models.person.js

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

export default Model.extend({
  hats: hasMany('hat', {
    async: false,
    polymorphic: true,
    inverse: 'person'
  }),
});

models.small-hat.js

import Hat from "./hat";

export default Hat.extend({
});

routes.application.js

import Ember from 'ember';
import DS from 'ember-data';
const { copy } = Ember;



const personData = {
  data: {
    id: '1',
    type: 'person', 
    attributes: {}
  }
};

const hatData = {
  data: {
    relationships: {
      person: { 
        data: { id: '1' , type: 'person' }
      }
    }
  }
};

let id = 1;
function makeHat(type) {
  const resource = copy(hatData, true);
  resource.data.id = `${id++}`;
  resource.data.type = type;
  
  return resource;
}

const bigHatData1 = makeHat('big-hat');
const bigHatData2 = makeHat('big-hat');
const smallHatData1 = makeHat('small-hat');
const smallHatData2 = makeHat('small-hat');
const smallHatData3 = makeHat('small-hat');

export default Ember.Route.extend({
	
  model() {
    const store = this.get('store');
    let person = store.push(personData);
    // works with created .. but not pushed records
    // if you even create ONE new record it all works fine
    
    // this.store.createRecord('big-hat', {person});
    // this.store.createRecord('small-hat', {person});
    store.push(bigHatData1);
    store.push(smallHatData1);
    store.push(bigHatData2);
    store.push(smallHatData2);

    return person;
  },
  
  setupController(controller, person) {
  	controller.setProperties({
      person,
      pushedHats: person.get('hats').toArray(),
      // in twiddle.json switch to ember-data: "2.13" to see it working
      DS 
    });
  }
});

templates.application.hbs

<h4>pushing polymophic records bug ember-data 2.14</h4>
<div>Ember Data: {{DS.VERSION}}</div>
<div>Person: {{person}}</div>
<h4>Should be 4 hats</h4>
<div>{{pushedHats}}</div>
<br>

twiddle.json

{
  "version": "0.12.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "mockjax": "https://cdnjs.cloudflare.com/ajax/libs/jquery-mockjax/1.6.2/jquery.mockjax.js",
    "ember": "2.12.0",
    "ember-template-compiler": "2.12.0",
    "ember-testing": "2.12.0"
  },
  "addons": {
    "ember-data": "2.14.7" 
  }
}