How to use Phoenix PubSub

[opal yoke]

I want users to subsribe to zones. And based off the zone receive events.

In this example I have shout. But my client receives the shout message multiple times.

What am I doing wrong?

def join("world:lobby", _message, socket) do
PubSub.subscribe(Rotb.PubSub, "zone_1")

{:ok, socket}

end

def handle_info(%{message: message}, socket) do
broadcast(socket, "shout", %{"socket_id" => socket.id, "message" => message})

{:noreply, socket}

end

def handle_in("shout", payload, socket) do
PubSub.broadcast(Rotb.PubSub, "zone_1", %{
message: payload["message"]
})

{:noreply, socket}

end

[opal yoke]

Broadcast is getting executed multiple times for a given PID. No clue why.

[sour axle]

I think PubSub.broadcast and broadcast are basically doing the same thing, so since you're calling them both, that's why you're getting the message twice

phoenix channels use PubSub under the hood and when using channels, the subscribing and broadcasting are sorta handled for you. Adding manual usage of PubSub on top of that I think is confusing...