didRender

components.x-bar.js

import Ember from 'ember';

export default Ember.Component.extend({
  changeSomething() {
    this.set('data', Math.random());
  }
});

components.x-foo.js

import Ember from 'ember';

export default Ember.Component.extend({
  data: null,
  internalData: null,
  
  didReceiveAttrs() {
    this._super(...arguments);
    console.log('x-foo didReceiveAttrs');
  },
  
  didRender() {
    this._super(...arguments);
    console.log('x-foo didRender');
  },
  
  changeInternal() {
    this.set('internalData', Math.random());
  }
});

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
  data: null,
  
  sendMoreData() {
    this.set('data', Math.random());
  }
});

templates.application.hbs

<p>
  {{x-foo data=data log=log}}
</p>
<p>
  <button onclick={{action sendMoreData}}>Send data to x-foo</button>
</p>

templates.components.x-bar.hbs

<div style="border: 2px solid yellow; padding: 1rem">
	<p>This is x-bar</p>
	<p>
  	Data: {{data}}
  </p>
	<p>
		<button onclick={{action changeSomething}}>Change a property of child component x-foo</button>
  </p>
</div>

templates.components.x-foo.hbs

<div style="border: 2px solid pink; padding: 1rem;">
  <p>
    This is x-foo
  </p>
  <p>
    Data: {{data}}
  </p>
  <p>
    Internal data: {{internalData}}
  </p>
  <p>
  	<button onclick={{action changeInternal}}>Change an internal property of x-foo</button>
  </p>
  <p>
  	{{x-bar}}
  </p>
</div>

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",
    "ember": "2.12.0",
    "ember-template-compiler": "2.12.0",
    "ember-testing": "2.12.0"
  },
  "addons": {
    "ember-data": "2.12.1"
  }
}