class StreamsChannel

The streams channel delivers all the turbo-stream actions created (primarily) through Turbo::Broadcastable. A subscription to this channel is made for each individual stream that one wishes to listen for updates to. The subscription relies on being passed a signed_stream_name parameter generated by turning a set of streamables into signed stream name using Turbo::Streams::StreamName#signed_stream_name. This is automatically done using the view helper Turbo::StreamsHelper#turbo_stream_from(*streamables). If the signed stream name cannot be verified, the subscription is rejected.

In case if custom behavior is desired, one can create their own channel and re-use some of the primitives from helper modules like Turbo::Streams::StreamName:

class CustomChannel < ActionCable::Channel::Base
  extend Turbo::Streams::Broadcasts, Turbo::Streams::StreamName
  include Turbo::Streams::StreamName::ClassMethods

  def subscribed
    if (stream_name = verified_stream_name_from_params).present? &&
        subscription_allowed?
      stream_from stream_name
    else
      reject
    end
  end

  def subscription_allowed?
    # ...
  end
end

This channel can be connected to a web page using :channel option in turbo_stream_from helper:

<%= turbo_stream_from 'room', channel: CustomChannel %>