Class Inheritable Attributes in CoffeeScript

gistfile1.coffee

# So messy. There must be a better way...

class Model
  @property: (name) ->
    if @properties? and @properties.length is @.__super__?.constructor.properties?.length
      @properties = Array::slice.call @.__super__.constructor.properties, 0
    else if not @properties?
      @properties = []

    @properties.push name

  props: ->
    @constructor.properties or []

class Something extends Model
  @property 'something'

class SomethingElse extends Something
  @property 'another'

class Separate extends Model
  @property 'final'

console.log 'Model',         (new Model).props()
console.log 'Something',     (new Something).props()
console.log 'SomethingElse', (new SomethingElse).props()
console.log 'Separate',      (new Separate).props()

# => Model []
# => Something ["something"]
# => SomethingElse ["something", "another"]
# => Separate ["final"]