gistfile1.coffee

createAttributeMonitor = ->
  monitored = Object.create null
 
  (parentModel, name) ->
    bubbleEvent = (event, args...) ->
      return unless event.startsWith 'change:'
      parentModel.trigger "change:#{name}.#{event[7..]}", args...
 
    value = parentModel.get name
    oldValue = monitored[name]
 
    if oldValue?
      return if value is oldValue
      oldValue.off 'all', bubbleEvent
 
    if value instanceof Backbone.Model or value instanceof Backbone.Collection
      monitored[name] = value
      value.on 'all', bubbleEvent