computed prop key example

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
	data: { cluster: { type: 'pg' }},
  
  computedTopLevel: Ember.computed('data', function() {
		return this.get('data.cluster.type') === 'pg' ? 'POSTGRES' : 'MYSQL';
  }),

	computedActualProp: Ember.computed('data.cluster.type', function() {
		return this.get('data.cluster.type') === 'pg' ? 'POSTGRES' : 'MYSQL';
  }),

	actions: {
		toggleType() {
			if (this.get('data.cluster.type') === 'pg') {
        this.set('data.cluster.type', 'mysql');
      } else {
        this.set('data.cluster.type', 'pg');
      }
    }
  }
});

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
Computed top level: {{computedTopLevel}}<br>
Computed actual prop: {{computedActualProp}}<br>
<button {{action "toggleType"}}>Toggle cluster type</button>
<br>
<br>

twiddle.json

{
  "version": "0.15.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "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"
  }
}