didreceiveattrs

application.controller.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName:'Ember Twiddle',
  post: {
    foo: 'bar'
  }
});

application.route.js

import Ember from 'ember';

export default Ember.Route.extend({
  actions: {
    changePost: function() {
      Ember.Logger.log('changing post');
      var post = { foo: 'baz' };
      this.controllerFor('application').set('post', post);
    }
  }
});

application.template.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
{{outlet}}
{{picture-in-picture post=post}}
<button {{action 'changePost'}}>Change</button>
<br>
<br>

components.picture-in-picture.js

import Ember from 'ember';

export default Ember.Component.extend({
  post: null,
  
  didIniteAttrs: function() {
    console.log('didInitAttrs');
  },
  
  didReceiveAttrs: function() {
    console.log('didreceiveattrs');
  }
});

picture-in-picture.js

import Ember from 'ember';

export default Ember.Component.extend({
  post: null,
  
  didReceiveAttrs: function() {
    console.log('didreceiveattrs');
  }
});

twiddle.json

{
  "version": "0.5.0",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/2.2.0/ember.debug.js",
    "ember-data": "https://cdnjs.cloudflare.com/ajax/libs/ember-data.js/2.2.0/ember-data.js",
    "ember-template-compiler": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/2.2.0/ember-template-compiler.js"
  }
}