module ActionCable::Channel::Broadcasting

def broadcast_to(model, message)
  ActionCable.server.broadcast(broadcasting_for([ channel_name, model ]), message)
end

def broadcasting_for(model) #:nodoc:
  case
  when model.is_a?(Array)
    model.map { |m| broadcasting_for(m) }.join(":")
  when model.respond_to?(:to_gid_param)
    model.to_gid_param
  else
    model.to_param
  end
end