gistfile1.coffee

class Feed
  fetch: ->
    url = "http://example.org/feed?x=1"
    url += "&ts=#{@oldest_item}" if @oldest_item

    $.getJSON url, (data) ->
      @oldest_item = data.oldest_item
      # do something else with data

# How can I set a class variable from an anonymous function? For example, @oldest_item on line 4 is always null.