gistfile1.coffee

# In the class
class Model
  fetch: (options = {}) ->
  opts = _.extend({}, options)

  _(opts).defaults
    method: 'GET'
    url: _.result(@, 'url')
  cancellableHttpRequest(opts).then(_(@parse).bind(@)).then(_(@set).bind(@))

# A helper method for allowing cancellable HTTP requests
cancellableHttpRequest = (opts) ->
  dfd = $q.defer()
  req = $http(opts)

  # Wrap the request promise with our promise
  req.then  (res) -> dfd.resolve(res)
  req.catch (res) -> dfd.reject(res)
  
  dfd.promise.cancel = -> dfd.reject('cancelled')
  
  return dfd.promise
  
# And usage in your app:
req = model.fetch(some: 'opts')
$scope.$on '$destroy', req.cancel()