Too Many Pixies Model

gistfile1.coffee

class Model
  @id: ->
    @_id = 1 unless @_id?
    @_id += 1
    @_id-1

  constructor: ->
    @id = Model.id()
    @attributes = _([])

  attr: (name, options) ->
    options = options || {
      default: null
    }

    this["_#{name}"] = options["default"]
    this["_#{name}_listeners"] = _([])

    @attributes.push name

    if options.get?
      this.__defineGetter__ name, _.bind(options.get, this)
    else
      this.__defineGetter__ name, -> this["_#{name}"]

    setter = null
    if options.set?
      setter = _.bind(options.set, this)
    else
      setter = (y) ->
        this["_#{name}"] = y

    this.__defineSetter__ name, (y) ->
      oldval = this[name]
      setter.call(this, y)
      newval = this[name]
      this["_#{name}_listeners"].each((fn) -> 
        _((-> 
          fn(newval, oldval)
        )).defer()
      ) #wait to fire these events

  listen: (property, fn) ->
    this["_#{property}_listeners"].push(fn)  

  unlisten: (property, fn) ->
    this["_#{property}_listeners"] = this["_#{property}_listeners"].without(fn)