Observe objects for changes

gistfile1.coffee

class ObjectObserver extends Eventual
  constructor: (@_object)->
    super
    @events_list = ['update']
    Object.defineProperty this, 'value', {
      get: -> @_object
      set: (new_value)->
        unless @object_compare(@_object, new_value)
          old_value = $.extend({}, @_object)
          @_object  = $.extend(true, @_object, new_value)
          @trigger 'update', old_value, @_object
        return @_object
    }

  update: (new_value)->
    return @value unless Object.isObject(new_value)
    @value = new_value
    
  object_compare: (obj1, obj2)->
    JSON.stringify(obj1) == JSON.stringify(obj2)
        
obj = {
  price: {}
  beach_distance: {}
}

@object_observer = new ObjectObserver(obj)

@object_observer.on 'update', (old_object, new_object)->
  console.log '%O => %O', old_object, new_object