Backbone base collection class

gistfile1.coffee

class BaseCollection extends Backbone.Collection

  _expiresAfter: 15 # seconds
  _lastFetched: null
 
  isStale: ->
    now = (new Date()).getTime()
    !@_lastFetched? || now - @_lastFetched > (@_expiresAfter * 1000)

  refresh: (models, options) ->
    super(models, options)
    @_lastFetched = (new Date()).getTime()
  
  fetch: (options = {}) ->
    callback = options.success
    options.success =(model, resp) =>
      @_lastFetched = (new Date()).getTime()
      callback(model, resp) if callback?
    super(options)