Dynamic channel topics with Phoenix

Hi all,

I’m having a problem which I cannot manage to solve on my own with phoenix channels. Specifically about channels with dynamic topics.

Given that I have the following channel setup:

channel "organization:*", TestWeb.OrganizationChannel

I want to connect on different channels based on dynamic ids passed as topics from the client. Based on a solution I found on an older post I did the following bit:

@impl true
  def join(
       "organization:" <> organization_id,
        params,
        socket
      ) do
    # some logic here

    Logger.debug("ORG ID -> ", organization_id)

    send(self(), :after_join)
    {:ok, socket}
  end

Everytime I connect to this channel with a topic string that looks like organization:4f1665fa-05d2-450a-bfbd-d105ebb00ede I receive the following error:

** (Protocol.UndefinedError) protocol Enumerable not implemented for "4f1665fa-05d2-450a-bfbd-d105ebb00ede" of type BitString

If I just run in iex “organization:” <> id = “organization:123”, the pattern matches ok. What am I missing here? Is there something special with the join handler?

Thanks in advance and I’m happy to join your community.