Active button in single component

components.button-navigation.js

import Ember from 'ember';


function addNavigation(navigationObject, name, icon){
  let toPush = navigationObject.create({
    name, icon,
  })
  this.get('navigations').push(toPush);
}

export default Ember.Component.extend({
  init(){
    let self = this;
    this._super(...arguments);
    let navigationObject = Ember.Object.extend({
      name: "",
      icon: "",
      flag: 0,
      isActive: Ember.computed('flag', function(){
        let isActive = this.get('name') === self.get('currentActive');
        return isActive ? "active" : "";
      })
    });

    addNavigation.call(this, navigationObject, 'list', 'icon-list2');
    addNavigation.call(this, navigationObject, 'notes', 'icon-file-text');
    addNavigation.call(this, navigationObject, 'new', 'icon-cancel-circle');
    addNavigation.call(this, navigationObject, 'search', 'icon-search');
    addNavigation.call(this, navigationObject, 'journal', 'icon-book');
  },
  currentActive: "list",
  navigationActive: Ember.computed(function(name){
    return this.get('currentActive') === name ;
  }),
  navigations: [],
  actions: {
    click(navigation){
      this.set('currentActive', navigation.name);
      this.get('navigations').forEach(x => {
        x.set('flag', x.get('flag') + 1 );
      });
    }
  }
});

controllers.application.js

import Ember from 'ember';

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

templates.application.hbs

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

{{button-navigation}}

templates.components.button-navigation.hbs

{{#each navigations as |nav|}}
  <button class="p-2 btn btn-outline-dark rounded-0 {{nav.isActive}}" {{action "click" nav}}>
    <span>{{nav.name}}</span>
  </button>
{{/each}}

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"
  }
}