Checkpoint Rails: Debugging for Rails Made Easy

Checkpoint Rails is a rolling, checkpoint debugger for Rails. It records all of the critical method calls within your app, along with their important context (param/argument/return/local variable values).

You no longer need to debug with binding.pry or puts statements, as the entire callstack for a given request is captured.
https://www.youtube.com/watch?v=NGqnwcNWv_k

checkpoint-rails is a Rails engine.  It's available as a gem to install within your own applications.

It utilizes Ruby's TracePoint class for the tracking of method call/returns. 

TracePoint is enabled/disabled via the Active Support Instrumentation callbacks, start_processing.action_controller and process_action.action_controller.

Add this line to your application's Gemfile:

gem "checkpoint-rails"

Add the following to your routes file

  if Rails.env.development? || Rails.env.test?
    mount Checkpoint::Rails::Engine, at: "/checkpoint"
  end

And then execute:

$ bundle

Usage

In development, open http://localhost:3000/checkpoint/ in a separate tab to observe the live call stack.