Question

I wonder if we can have in Rails an interactive shell when exceptions occurs accessible directly in the browser (so interacting with server via javascript)

I love this functionality bring up by Werkzeug. Examples of the Werkzeug Debugger :

• http://werkzeug.pocoo.org/docs/debug/#enabling-the-debugger
• http://flask.pocoo.org/docs/quickstart/#debug-mode

It can be great if we can do the same in Rails. Do you know some ways to archive this ?

Answer 1

You can catch all exceptions in ApplicationController and do whatever you want, like start a breakpoint.

if Rails.env.development?
  rescue_from Exception, :with => :fire_up_debugger
end

private
  def fire_up_debugger(e)
    print "An exception has happened: #{e.message}\n\n#{e.backtrace.join("\n")}"
    debugger # or binding.pry if you use pry
  end