Ember Data meta relationship

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
  
  parents: null,
  
  actions: {
	  clear() {
      this.store.unloadAll('parent');
      this.store.unloadAll('child');
      this.set('model', null);
    },
  
	  loadParent() {
    	this.store.pushPayload({
        data: {
          id: 1,
          type: 'parent',
          relationships: {
            children: {
              data: [
                { id: 1, type: 'child' },
                { id: 2, type: 'child' }
              ]
            }
          }
        },
        included: [
          { id: 1, type: 'child' },
          { id: 2, type: 'child' }
        ]
      });
      console.log('loadParent')
      
      this.set('model', this.store.peekAll('parent'));
    },
    
    loadMeta() {
      this.store.pushPayload({
        data: {
          id: 1,
          type: 'parent',
          relationships: {
            children: {
              meta: { included: false }
            }
          }
        }
      });
      console.log('loadMeta')
      this.set('model', this.store.peekAll('parent'));
    }
  }
});

models.child.js

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

export default Model.extend({
});

models.parent.js

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

export default Model.extend({
  children: hasMany('child')
});

serializers.application.js

import DS from 'ember-data'

export default DS.JSONAPISerializer.extend({
extractRelationships(modelClass, resourceHash) {
    let relationships = this._super(modelClass, resourceHash)

    console.log(relationships)

    return relationships
  },
})

templates.application.hbs

{{#each model as |parent|}}
  Parent {{parent.id}} has
  {{#each parent.children as |child|}}
    child {{child.id}}
  {{/each}}
{{/each}}


<br/>

<button {{action "loadParent"}}>Load Parent with children</button>
<button {{action "loadMeta"}}>Load Parent without children</button>
<button {{action "clear"}}>Clear</button>

twiddle.json

{
  "version": "0.13.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.16.2",
    "ember-template-compiler": "2.16.2",
    "ember-testing": "2.16.2"
  },
  "addons": {
    "ember-data": "2.16.3"
  }
}