Example of Backend class for photos displaying problem

backend.coffee

class Photos.Backend
  fetchPhotos: =>
    request = $.ajax(
                url: '/photos'
                type: 'GET'
                contentType: 'application/json'
               )
               .then (response) =>
                 photos = []
                 for photo in response.photos
                   photos.append(Photos.Photo.fromJSON(photo))
                 photos