Backbone event relay

backbone-event-relay.coffee

((root, props) ->
  relayEvent = ->
    a = _.chain(arguments).toArray()
    a.unshift(@) if a.size().value() is 2
    ((from, to, eventName) ->
      from.on(eventName, ->
        a = _.chain(arguments)
             .toArray()
             .unshift(eventName)
        to.trigger.apply(to, a.value())
        to
      )).apply(@, a.value())

  root[name]::relayEvent = relayEvent for name in props when not _.isUndefined root[name]

)(Backbone, ['View', 'Model', 'Collection', 'Router'])