New Twiddle

components.child-component.js

import Ember from 'ember';

export default Ember.Component.extend({
  
});

components.dialog-component.js

import Ember from 'ember';

export default Ember.Component.extend({ 
  domain: Ember.inject.service(),
  actions: {
   	updateValue(){
     	 this.get('onUpdate')()
    }
  }
});

controllers.application.js

import Ember from 'ember';
import UpdateMixin from '../mixins/update';

export default Ember.Controller.extend( UpdateMixin, {
  domain: Ember.inject.service(),
  appName: 'Ember Twiddle',
  actions: {
   	validateFirst(){
      this.get('domain').validate()
    }
  }
});

mixins.update.js

import Ember from 'ember';

export default Ember.Mixin.create({

  updated_val: 'Empty',
  
  actions:{
    updateValue(){
     
      var self = this;
      alert(self.get('updated_val'));
     	self.set( 'updated_val', self.send( 'childAction' ) );
           
    }
  }

}); 

services.domain.js

import Ember from 'ember';

export default Ember.Service.extend({
  updated_val: 'Empty',
  final_val: 'Empty',
  validate(){
   	console.log('validate') 
    console.log(this.get('updated_val'))
    if(this.get('updated_val') === 'Empty'){
      //this.set('updated_val',
    }
  }
});

styles.app.css

body {
  margin: 12px 16px;
  font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
  font-size: 12pt;
}

.dialog{
	border: solid 1px;
  width: 300px;
  height: 100px;
}

templates.components.child-component.hbs

{{input value=(mut child_val)}}

templates.components.dialog-component.hbs

<div class='dialog'>
	{{yield}}
	<button {{action 'updateValue' }}> Update </button>
</div>

twiddle.json

{
  "version": "0.7.2",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.4.4",
    "ember-data": "https://cdnjs.cloudflare.com/ajax/libs/ember-data.js/2.4.3/ember-data.js",
    "ember-template-compiler": "2.4.4"
  }
}