问Heroku上的ActionController::Live(Rails4)，发布/订阅(Redis)不工作

EN

class BeginnerMessagesController < ApplicationController

include ActionController::Live

def index
  @beginner_messages = BeginnerMessage.all.order("created_at DESC")

end

def create  
  response.headers["Content-Type"] = "text/javascript"
  attributes = params.require(:beginner_message).permit(:body)
  @beginner_message = BeginnerMessage.new(attributes)
  @beginner_message.user = current_user
  @beginner_message.save

  json_message = @beginner_message.to_json
  hash_result = JSON.parse(json_message)
  hash_result[:username] = @beginner_message.user.username
  hash_result[:created_at] = @beginner_message.created_at.strftime("%H:%M")
  @json_result = hash_result.to_json
  $redis.publish('beginner_messages.create', @json_result)
end

def events
  response.headers["Content-Type"] = "text/event-stream"
  redis = Redis.new
  redis.psubscribe('beginner_messages.*') do |on|
  on.pmessage do |pattern, event, data|
       response.stream.write("event: #{event}\n")
       response.stream.write("data: #{data}\n\n")
     end
   end
 end
rescue IOError
  logger.info "Stream closed"
ensure
  redis.quit
  response.stream.close
end

source = new EventSource('/beginner_messages/events')
source.addEventListener 'beginner_messages.create', (e) ->
  beginner_message = $.parseJSON(e.data)
  $('#chat').prepend($('<li>').text("#{beginner_message.username} $ #{beginner_message.body} #{beginner_message.created_at}").css("listStyleType","none"))