New Twiddle

controllers.application.js

import Ember from 'ember';

const { computed, defineProperty, get, set } = Ember;

export default Ember.Controller.extend({
  number: 0,
  update_number: {
    value: 0,
	  some_other_value: 100
  },
   
  init() {
    this._super();
    
    for (let k in get(this, 'update_number')) {
      defineProperty(this, `update_number.${k}`, computed(`update_number.${k}`, function() {
        console.log(`fired with ${k}`);
        // Do something generic
        let n = get(this, 'number');
        set(this, 'number', n + 1);
      }));
    }
  },

  actions: {
    update_some_other_value() {
      let num = get(this, 'update_number.some_other_value');
      set(this, 'update_number.some_other_value', num + 1);
    },
    update_value() {
      let num = get(this, 'update_number.value');
      set(this, 'update_number.value', num + 1);
    }
  }
});

templates.application.hbs

<br>
<button class="btn btn-primary" {{action "update_some_other_value"}}>+ Update Some Other Value</button>
<br>
<br>
<button class="btn btn-primary" {{action "update_value"}}>+ Update Value</button>
<br>
<br>
Number of times any value on the model was updated : {{number}}

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"
  }
}