acalinica

acalinica

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.

Marked As Solved

benwilson512

benwilson512

Author of Craft GraphQL APIs in Elixir with Absinthe

Hey @acalinica the issue relatively straightforwardly is your Logger.debug call. Logger — Logger v1.20.2 The arguments to Logger.debug are msg and opts so you’re passing in organization_id where it expects options.

To fix simply:

Logger.debug("ORG ID -> #{inspect(organization_id)}")

For me personally when I’m just doing this sort of development logging I just use Kernel — Elixir v1.20.2 so you can just dbg(organization_id)

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dimitarvp

dimitarvp

You beat me by 10 seconds. Kudos. Or I am getting old.

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