emberjs-issue-14657

controllers.application.js

import Ember from 'ember';

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

models.user.js

import Model from "ember-data/model";
import attr from "ember-data/attr";
import { belongsTo, hasMany } from "ember-data/relationships";

export default Model.extend({
  login: attr('string')
});

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('timecards', {path: '/timecards/:login'}, function() {
  	this.route('index', { path: '/' });
  	this.route('timecard-day', {path: '/day/:date'});
  	this.route('pay-period', {path: '/pay-period/:date'});
	});
});

export default Router;

routes.application.js

import Ember from 'ember';

export default Ember.Route.extend({
    model() {
      this.store.createRecord('user', {login: 'aaron'});
      this.store.createRecord('user', {login: 'mike'});
			this.store.createRecord('user', {login: 'sam'});
      
      return this.store.peekAll('user');
    },
});

routes.timecards.day.js

import Ember from 'ember';

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

routes.timecards.index.js

import Ember from 'ember';

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

routes.timecards.js

import Ember from 'ember';

export default Ember.Route.extend({
  model(params) {    
    let login = params.login || 'aaron';
    return this.store.peekAll('user').findBy('login', login);
  }
});

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
<ul>
{{#each model as |u|}}
  <li> 
    {{#link-to "timecards" u}}
      {{u.login}}
    {{/link-to}}
  </li>
{{/each}}
<li>
{{#link-to "timecards" undefined}}
	Timecards using default user.
{{/link-to}}
</li>

<li>
<!-- used to work -->
{{#link-to "timecards" }}
	Timecards using default user without paramater.
{{/link-to}}</li>

</ul>
<br>
<br>

{{yield}}

templates.timecards.hbs

<h3>{{model.login}}</h3>

twiddle.json

{
  "version": "0.10.6",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.10.0",
    "ember-data": "2.10.0",
    "ember-template-compiler": "2.10.0",
    "ember-testing": "2.10.0"
  },
  "addons": {}
}