Example of CatchAll use about stealth

[mgomes]

Hi @luizcarvalho!

Here's what a typical catch_alls_controller.rb looks like for us:

class CatchAllsController < BotController

  def level1
    send_replies

    if previous_session_specifies_fails_to?
      step_to flow: previous_session.flow_string, state: previous_state.to_s
    else
      step_to session: previous_session - 2.states
    end
  end

  def level2
    send_replies

    if previous_session_specifies_fails_to?
      step_to flow: previous_session.flow_string, state: previous_state.to_s
    else
      step_to session: previous_session - 2.states
    end
  end

  def level3
    send_replies
  end

private

   def previous_session_specifies_fails_to?
     previous_state.present?
   end

   def previous_state
     previous_session.flow.current_state.fails_to
   end

end

As you can see it is pretty generic. Once we get to the last level (level3 here), we don't redirect the user back anymore. Here we would typically hand off to a human or ask the user to contact support because something has really gone wrong.

With respect to getting access to error messages, I am not sure this is something we will support. If you want to catch errors in order to return a message to the user, you should do that in your controller action. The CatchAll is designed for unexpected failures. You can think of the CatchAll like a 500 error page and not a form error. Does that make sense?

[luizcarvalho]

@mgomes Nice approach in the catch all levels, I understand now what is the objective. Made sense to me. Very thanks for the explanation.