Im trying to redo the server sent events example from drab using hub but im getting the following error when connection to the page that should render all events.
[error] Drab Handler failed with the following exception:
** (Protocol.UndefinedError) protocol Enumerable not implemented for nil. This protocol is implemented for: DBConnection.PrepareStream, DBConnection.Stream, Date.Range, Ecto.Adapters.SQL.Stream, File.Stream, Floki.HTMLTree, Function, GenEvent.Stream, HashDict, HashSet, IO.Stream, List, Map, MapSet,Postgrex.Stream, Range, Stream
(elixir) /private/tmp/elixir-20180620-82402-14wughj/elixir-1.6.6/lib/elixir/lib/enum.ex:1: Enumerable.impl_for!/1
(elixir) /private/tmp/elixir-20180620-82402-14wughj/elixir-1.6.6/lib/elixir/lib/enum.ex:141: Enumerable.reduce/3
(elixir) lib/enum.ex:1919: Enum.reduce/3
(drab) lib/drab/live.ex:968: Drab.Live.decrypted_assigns/1
(drab) lib/drab/live.ex:958: Drab.Live.decrypted_from_browser/1
(drab) lib/drab/live.ex:918: Drab.Live.assigns_and_nodrab/1
(drab) lib/drab/live.ex:574: Drab.Live.do_poke/5
(streamdemo) lib/streamdemo_web/commanders/gen_commander.ex:18: StreamdemoWeb.GenCommander.handle_event/1
(drab) lib/drab.ex:286: anonymous fn/3 in Drab.handle_callback/3
This is the code that throws the exception.
defmodule StreamdemoWeb.GenCommander do
use Drab.Commander
require Hub
require Logger
onconnect :connected
def connected(socket) do
sub = Hub.subscribe("channel", _)
Logger.debug("Connected and subscribed #{inspect sub}")
handle_event(socket)
end
defp handle_event(socket) do
receive do
%{age: age, name: name} = msg ->
socket
|> IO.inspect()
|> poke(genevent: "dd")
end
handle_event(socket)
end
end
