New Twiddle

controllers.application.js

import Ember from 'ember';

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

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({
  firstName: attr("string"),
  lastName: attr("string"),
  visits: belongsTo("visit")
});

models.visit.js

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

export default Model.extend({
  name: attr("string"),
  users: hasMany("user"),
});

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('visits');
  this.route('visit', { path: '/visit/:visit_id'});
  this.route('users');
});

export default Router;

routes.application.js

import Ember from 'ember';

export default Ember.Route.extend({
   beforeModel() {
    var user1 = this.store.createRecord("user", {
      firstName: "First",
      lastName: "User",
    });
    
		var user2 = this.store.createRecord("user", {
      firstName: "Second",
      lastName: "User",
    });
    
   	var user3 = this.store.createRecord("user", {
      firstName: "Third",
      lastName: "User",
    });
    
		var user4 = this.store.createRecord("user", {
      firstName: "Fourth",
      lastName: "User",
    });
    
    var user5 = this.store.createRecord("user", {
      firstName: "Fifth",
      lastName: "User",
    });
    
    var visit1 = this.store.createRecord("visit", {
      id: 1,
      name: "Morning Visit",
      users: [user1, user2, user3]
    });
    
    var visit2 = this.store.createRecord("visit", {
      id: 2,
      name: "Afternoon Visit",
      users: [user4, user5]
    });
  },

  redirect: function () {
        this.transitionTo('visits');
  }
  
  });

routes.visit.js

import Ember from 'ember';

export default Ember.Route.extend({
	 	model: function(params) {
        return this.get('store').findRecord('visit', params.visit_id);
      }
});

routes.visits.js

import Ember from 'ember';

export default Ember.Route.extend({
  model() {
    return this.get('store').findAll('visit')
  }
});

templates.application.hbs

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

templates.visit.hbs

<h2>Users under {{model.name}}</h2>

<table>
	<thead>
  	<tr>
    	<th>First</th>
  		<th>Last</th>
     </tr>
  </thead>
  <tbody>
   	{{#each model.users as |user|}}
    	<tr>
        <td>{{user.firstName}}</td>
        <td>{{user.lastName}}</td>
      </tr>
    {{/each}}
  </tbody>
</table>

templates.visits.hbs

<h2>List of visits</h2>
<table>
	<thead>
  	<tr>
    	<th></th>
      <th>Name</th>
  		<th>Users</th>
     </tr>
  </thead>
  <tbody>
  	{{#each model as |visit|}}
      <tr>
      	<td>{{visit.id}}</td>
        <td>
        	{{#link-to 'visit' visit.id }}
          	{{visit.name}}
          {{/link-to}}
         </td>
        <td>{{visit.users.length}}</td>
      </tr>
    {{/each}}
  </tbody>
</table>

twiddle.json

{
  "version": "0.10.5",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.8.0",
    "ember-data": "2.8.0",
    "ember-template-compiler": "2.8.0",
    "ember-testing": "2.8.0"
  },
  "addons": {}
}