"Error while processing route: portfolio_item params is not defined ReferenceError: params is not defined" ~~ Eventhough my URL is: http://localhost:3000/#/portfolio/1

routes.js.coffee

App.Router.map ->
  @resource 'portfolio_items',  { path: '/' }
  @resource 'portfolio_item',   { path: '/portfolio/:portfolio_item_id' }

# PortfolioItems#index
App.PortfolioItemsRoute = Ember.Route.extend( model: ->
  portfolioItems
)

App.PortfolioItemRoute = Ember.Route.extend( model: ->
  portfolioItems.findBy "id", params.portfolio_item_id
)

portfolioItems = [
  {
    id:       '1',
    name:     'JustDrawCats',
    desc:     'YouTuber & Twitch streamer',
    thumb:    'assets/portfolio_items/justdrawcats_thumb.png'
  },
  {
    id:       '2',
    name:     'NAM',
    desc:     'Nederlandse Aardolie Maatschappij iPad-app',
    thumb:    'assets/portfolio_items/nam_thumb.png'
  },
  {
    id:       '3',
    name:     'Blossom',
    desc:     'iPad- & Webapp for health care',
    thumb:    'assets/portfolio_items/blossom_thumb.png'
  },
  {
    id:       '4',
    name:     'WatVoorChips',
    desc:     'HTML5 app for picking the right flavoured crisps',
    thumb:    'assets/portfolio_items/watvoorchips_thumb.png'
  },
  {
    id:       '5',
    name:     'Sinterklaas Lootjes',
    desc:     'An easier system to share Dutch Sinterklaas lootjes',
    thumb:    'assets/portfolio_items/sinterklaaslootjes_thumb.png'
  },
  {
    id:       '6',
    name:     'Kerstmis Weken',
    desc:     'An website to track the progress of JustDrawCats\' charity event',
    thumb:    'assets/portfolio_items/kerstmisweken_thumb.png'
  }
]

Fixed.