so#4915783

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
  user: {id: 11}
});

router.js

import Ember from 'ember';
import config from './config/environment';

const Router = Ember.Router.extend({
  location: 'none',
  rootURL: config.rootURL
});

Router.map(function() {
  this.route('users', { path: '/users' }, function(){
 this.route('show', { path: '/:user_id' }, function(){
    this.route('history',{ path: '/history' });
 });});
});

export default Router;

routes.users.js

import Ember from 'ember';

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

routes.users.show.history.js

import Ember from 'ember';

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

routes.users.show.js

import Ember from 'ember';

export default Ember.Route.extend({
  model(params) {
    return {id: params.user_id};
  }
});

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
{{#link-to "users.show.history" user}}The link for user stored in application controller{{/link-to}}<br>
{{#link-to "users.show.history" 3}}The link for user with id 3{{/link-to}}<br>
{{outlet}}
<br>
<br>

templates.users.hbs

This is users<br>
{{outlet}}

templates.users.show.hbs

This is show {{model.id}}<br>
{{outlet}}

templates.users.show.history.hbs

This is history<br>

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"
  }
}