Simple Example

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({

})

controllers.menu.js

import Ember from 'ember';

export default Ember.Controller.extend({
  currentlyOpen: null,
  actions: {
    open(title){
      const typeHash = this.get(title)
      this.set('currentlyOpen',typeHash)
    }
  }
});

helpers.eq.js

import Ember from 'ember';

export function eq(params) {
  return params[0] === params[1];
}

export default Ember.Helper.helper(eq);

mirage.config.js

export default function() {
  window.server = this;
  this.get('users')
  this.get('todos')
};

mirage.fixtures.todos.js

export default [
	{id:1,title:'First Todo',creator:1,editor:2},
  {id:2,title:'Second Todo'},
]

mirage.fixtures.users.js

export default [
	{id:1,name:'User 1'},
  {id:2,name:'User 2'},
]

mirage.models.todo.js

import { Model, belongsTo } from 'ember-cli-mirage';

export default Model.extend({
  //creator: belongsTo(),
  //editor: belongsTo()
});

mirage.models.user.js

import { Model } from 'ember-cli-mirage';

export default Model.extend({
});

mirage.scenarios.default.js

export default function(server) {
  window.server = server;
  server.create('todo');
  server.create('user');
}

models.todo.js

import Model from 'ember-data/model'
import attr from 'ember-data/attr'
import { belongsTo } from 'ember-data/relationships'

export default Model.extend({
  title: attr('string'),
  done: attr('boolean'),
  editor: belongsTo('user'),
  creator: belongsTo('user'),
  createdAt: attr('date'),
  modifiedAt: attr('date')
})

models.user.js

import Model from 'ember-data/model'
import attr from 'ember-data/attr'

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

router.js

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

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

Router.map(function() {
  this.route('todos')
  this.route('new')
  this.route('edit', { path: 'edit/:todo_id' })
});

export default Router;

routes.edit.js

import Ember from 'ember';

export default Ember.Route.extend({
  model: function() {
    return Ember.RSVP.hash({
      todo: this.store.findRecord('todo',params.todo_id),
      users: this.store.findAll('user')
    })
  },
  setupController(controller, model){
   this._super(controller,model)
   
  }
});

routes.new.js

import Ember from 'ember';

export default Ember.Route.extend({
  model: function() {
    return Ember.RSVP.hash({
      todo:  this.store.createRecord('todo'),
      users: this.store.findAll('user')
    })
	}
});

routes.todos.js

import Ember from 'ember';

export default Ember.Route.extend({
  model: function() {
    return this.store.findAll('todo')
  }
});

templates.application.hbs

{{link-to 'All Todos' 'todos'}}|{{link-to 'New Todo' 'new'}}<br>

{{outlet}}

templates.edit.hbs

Edit Todo:<br/>
{{input value=model.title}}<br/>
Task Completed:{{input type='checkbox' checked=model.todo.done}}<br/>

Select Creator:
<select onchange={{action (mut model.todo.creator) value="target.value"}}>
  {{#each model.users as |userChoice|}}
    <option value={{userChoice.name}} selected={{eq user userChoice}}>{{userChoice.name}}</option>
  {{/each}}
</select>

Select Editor:
<select onchange={{action (mut model.todo.editor) value="target.value"}}>
  {{#each model.users as |userChoice|}}
    <option value={{userChoice.name}} selected={{eq user userChoice}}>{{userChoice.name}}</option>
  {{/each}}
</select>

templates.new.hbs

New Todo:<br/>
{{input value=model.todo.title}}<br/>

Select Creator:
<select onchange={{action (mut model.todo.creator) value="target.value"}}>
  {{#each model.users as |userChoice|}}
    <option value={{userChoice.name}} selected={{eq user userChoice}}>{{userChoice.name}}</option>
  {{/each}}
</select>

Select Editor:
<select onchange={{action (mut model.todo.editor) value="target.value"}}>
  {{#each model.users as |userChoice|}}
    <option value={{userChoice.name}} selected={{eq user userChoice}}>{{userChoice.name}}</option>
  {{/each}}
</select>

templates.todos.hbs

Todos:
<hr/>
<ul>
{{#each model as |todo|}}
	<li>
    {{input type='checkbox' checked=todo.done}}
    {{todo.title}}
  	{{#link-to 'edit' todo}}
    	Edit
    {{/link-to}}
    Editor:{{todo.editor.name}}
  </li>
{{/each}}
</ul>

twiddle.json

{
  "version": "0.8.0",
  "ENV": {
    "ember-cli-mirage": {
      "enabled": true
    }
  },
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.5.1",
    "ember-data": "2.5.2",
    "ember-template-compiler": "2.5.1"
  },
  "addons": {
    "ember-cli-mirage": "0.2.0-beta.8"
  }
}