ActionCableのChannelでもcookies、sessionを使いたい

Connection

Connection側はrequestが見れるので、直接触れる
https://qiita.com/sasurai_usagi3/items/8f744cb732b0b522f33f

Channel

connectionへの変数を持っているのでそこからcookiesを使う

class ChatChannel < ApplicationCable::Channel

  ...
  ...

  private

  def session
    session_key_name = Rails.application.config.session_options[:key]
    cookies.encrypted[session_key_name]&.with_indifferent_access
  end

  def cookies
    connection.send(:cookies)
  end
end