Show UserID in log files with UUID

application.rb

    # Hack around the middleware stack a bit to get warden session correctly in
    config.middleware.delete(ActionDispatch::Cookies)
    config.middleware.delete(ActionDispatch::Session::CookieStore)
    config.middleware.insert_before(Rails::Rack::Logger, ActionDispatch::Session::CookieStore)
    config.middleware.insert_before(ActionDispatch::Session::CookieStore, ActionDispatch::Cookies)

    # Rotate two files, max 5 mb each
    config.logger = ActiveSupport::TaggedLogging.new(Logger.new(config.paths['log'].first, 2, 5 * 1024 * 1024))

    config.log_tags = [
      :uuid,
      -> request {
        key = request.session["warden.user.user.key"] #Second user is the name of the authenticating object
        if key
          "ClientAccount##{key[0][0]}"
        else
          "Anonymous"
        end
      }
    ]