EmberJS Error message: Assertion Failed: Cannot find model name

I am in the mids of following: Vic Ramon EmberJS tutorial. I reached the point where I am trying to list the leads and have the following setup:

Adapter

App.Store = DS.Store.extend()
App.ApplicationAdapter = DS.ActiveModelAdapter.extend()

DS.RESTAdapter.reopen
  namespace: 'api/v1'

Controller

App.LeadsController = Ember.ArrayController.extend
  sortProperties: ['firstName', 'lastName']

Model

App.Lead = DS.Model.extend
  firstName:  DS.attr('string')
  lastName:   DS.attr('string')
  email:      DS.attr('string')
  phone:      DS.attr('string')
  status:     DS.attr('string', defaultValue: 'new')
  notes:      DS.attr('string')


  fullName: (->
    @get('firstName') + ' ' + @get('lastName')
  ).property('firstName', 'lastName')

Routes

App.LeadsRoute = Ember.Route.extend

  model: ->
    @store.findAll 'lead'

Router

App.Router.reopen
  location: 'auto'
  rootURL: '/'

App.Router.map ()->
  @resource 'leads', path: '/'
  @resource 'lead', path: 'leads/:id'

Template

<article>
    <h1>Leads</h1>
    <ul>
      {{#each lead in controller}}
        <li>{{#link-to 'lead' lead}}{{/link-to}}</li>
          {{lead.fullName}}
      {{/each}}
    </ul>
</article>

The issue simply is when I redirect my browser to http://localhost:3000 it shows me the list of fullNames but doesn't show me the anchor links. Also another thing I seem to get in my chrome browser console is:

Error message: Assertion Failed: Cannot find model name

Bonus Question

From reading a few books an tutorials I understand that you can include mixins as a way of injecting additional properties into Controllers or Views. So for example you can do:

Ember.View.extend(App.Editable)

But can you include a mixin into a model? As in can you do:

App.Lead = DS.Model.extend(App.SomeMixin)