Example of passing actions from controller to nested component

a-teeny-component.component.js

import Ember from 'ember';

export default Ember.Component.extend({
  // this component only received args from the caller
  // but it does track its own local info property
  
  info: '', // initial form field value
});

a-teeny-component.template.hbs

<div class='border'>
	<span>a-teeny-component -- local info: {{this.info}}</span>
	{{input value=this.info placeholder='this info is two-way bound locally to the component'}}

	<button onclick={{action @sendTheForm this.info}}>submit</button>
</div>

controllers.application.js

import Ember from 'ember';
import { computed } from '@ember/object';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
  
  info: '',
  aComplexInfo: {
    nestedData: ''
  },
  
  dataDisplay: computed('aComplexInfo.nestedData', function() {
    return JSON.stringify(this.aComplexInfo);
  }),
  
  actions: {
  	sendTheForm(info) {
      console.log('sendTheForm received', info);
    	this.set('info', info);
    },
    
    updateNestedData(nestedData) {
      console.log('updateNestedData received', nestedData);
      this.set('aComplexInfo.nestedData', nestedData);
    }
  }
});

helpers.stringify.js

import Ember from 'ember';

export function stringify(params/*, hash*/) {
  return JSON.stringify(params[0]);
}

export default Ember.Helper.helper(stringify);

my-component.component.js

import Ember from 'ember';

export default Ember.Component.extend({
  // this component only receives args from the caller
});

my-component.template.hbs

<div class='border'>

	<span>my-component - type something into the form below and click submit</span>
  
	<ATeenyComponent @sendTheForm={{this.sendTheForm}} />
  
</div>

nested-data-form.component.js

import Ember from 'ember';

export default Ember.Component.extend({
  text: ''
});

nested-data-form.template.hbs

<div class='border'>
	<span>nested-data-form</span>
	{{input value=this.text}}

	<button onclick={{action @onSubmit this.text}}>submit</button>
  
  <br><br>
  Two way bound: <br>
  {{input value=@data.nestedData}}
</div> 

styles.app.css

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

.border {
  border: 1px solid;
  padding: 10px;
}
span {
  display: block;
  padding-bottom: 10px; 
}

input[type='text'] {
  width: 100%; 
}

button {
  margin-top: 5px; 
}

templates.application.hbs

<h1>Welcome to {{appName}}</h1>


Controller's Info: {{this.info}}
<br><br>
<MyComponent @sendTheForm={{action 'sendTheForm'}} />

<br><br>
Controller's Data: {{this.dataDisplay}}
<NestedDataForm 
  @data={{this.aComplexInfo}}
	@onSubmit={{action 'updateNestedData'}} 
/>

twiddle.json

{
  "version": "0.15.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": true,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.js",
    "ember": "3.4.3",
    "ember-template-compiler": "3.4.3",
    "ember-testing": "3.4.3"
  },
  "addons": {
    "ember-data": "3.4.2"
  }
}