https://stackoverflow.com/questions/45736729/ember-send-action-from-one-component-to-other

components.my-field.js

import Ember from 'ember';

export default Ember.Component.extend({
  fldName:'first name'
});

components.my-scale.js

import Ember from 'ember';

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

components.my-textfield.js

import Ember from 'ember';

export default Ember.Component.extend({
  actions:{
    onFieldChange(){
      console.log('onFieldChange');
    }
  }
});

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle'
});

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
{{#my-scale as |onFieldChange|}}

{{#my-field as |onFieldChange|}}
 {{log 'my-field block onFieldChange' onFieldChange}}
{{/my-field}}

{{/my-scale}}
<br>
{{outlet}}
<br>
<br>

templates.components.my-field.hbs

{{my-textfield label=fldName key-up="onFieldChange"}}
{{log 'my-field ' onFieldChange}}
{{yield onFieldChange}}

templates.components.my-scale.hbs

{{log 'onFieldChange' onFieldChange}}

{{yield}}

templates.components.my-textfield.hbs

{{label}}
{{yield (action 'onFieldChange')}}

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"
  }
}