Auto save an Ember.js model (DS.Model)

autosavemodel.coffee

get = Ember.get

App.BaseModel = DS.Model.extend

  autoSave: (->
    if get(@, 'isDraft') and !(get @, 'isNew') and isReallyDirty @
      Ember.run.debounce @, '_doAutoSave', 12000
  ).observes 'isDirty'

  _doAutoSave: ->
    @save() if get @, 'isDirty'

  isDraft: (->
    get(@, 'status') is 'draft'
  ).property 'status'

# Strange that model can be dirty with no changed attrs
isReallyDirty = (model) ->
  hasChangingAttr = false
  attrs = []
  model.eachAttribute (name)-> attrs.push name
  for own key, value of model.changedAttributes()
    if attrs.contains key
      hasChangingAttr = true
      break
  hasChangingAttr