Polymorphic Models

controllers.application.js

import Ember from 'ember';
import { inject as service } from '@ember/service';
import { get, set } from '@ember/object';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
  
  store: service(),
  
  init() {
    this._super(...arguments);
    let whiskers = get(this, 'store').createRecord('cat', { name: 'Whiskers' });
    let animalPatient = get(this, 'store').createRecord('animal-patient', {
      animals: [whiskers]
    });
    set(this, 'animalPatient', animalPatient);
  }
});

models.animal-patient.js

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

export default Model.extend({
    animals: DS.hasMany('animal', { polymorphic: true })
});

models.animal.js

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

export default Model.extend({
   animalPatient: DS.belongsTo('animal-patient', { inverse: 'animal' }),
});

models.cat.js

import DS from 'ember-data';
import Animal from './animal';

export default Animal.extend({
  name: DS.attr(),
  animalType: 'cat'
});

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
{{animalPatient.animals.firstObject.name}} is a(n) {{animalPatient.animals.firstObject._internalModel.modelName}}
{{outlet}}
<br>
<br>

twiddle.json

{
  "version": "0.15.0",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.js",
    "ember": "3.2.2",
    "ember-template-compiler": "3.2.2",
    "ember-testing": "3.2.2"
  },
  "addons": {
    "ember-data": "3.2.0"
  }
}