Rails : Add debugging lesson for debugging `rails` using `rdbg`

[XAJX179]

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Describe your suggestion

This issue is for proposing content on debugging rails applications using rdbg.

By the time people will get to Ruby on Rails course they would already have an idea about debugging current ruby file using vscode and setting up launch.json configuration. (releated issue : #30210 )

• show how to run application as a remote debuggee:
  • adding require 'debug/open_nonstop' to top of config/environments/development.rb
  • running - rdbg --open --nonstop -c rails s
• show to how to attach the remote debugger console to the debuggee:
  • create default rdbg launch.json first.
  • go to Debug and Run Ctrl + Shift + D window in vscode and change debug current file with rdbg option to Attach with rdbg and click F5. (will automatically connect to the UNIX domain socket if only one is there)
  • add breakpoints and open the site in browser localhost:3000 and start debugging.
• show how to use TCP/IP:
  • rdbg --open --port=38698 -c rails s or set RUBY_DEBUG_PORT=38698 environment variable.
  • setup launch.json for using port.
• explain the options -c, --open and --nonstop.

If you don't want to stop the program at the beginning, you can also use require 'debug/open_nonstop'. Using debug/open_nonstop is useful if you want to open a backdoor to the application. However, it is also dangerous because it can become another vulnerability. Please use it carefully.

• explain why we should be careful with using it.
• assignment with links to README of https://github.com/ruby/vscode-rdbg?tab=readme-ov-file and https://github.com/ruby/debug?tab=readme-ov-file#use-rdbg-with-commands-written-in-ruby

No idea where we should introduce this lesson...maybe before deployment?

Path

Ruby / Rails

Lesson Url

https://www.theodinproject.com/lessons/ruby-on-rails-deployment

(Optional) Discord Name

No response

(Optional) Additional Comments

No response

[JoshDevHub]

I think there should absolutely be some content on this, but I'm also inclined to put it in the backlog for right now. I need to discuss with the team more about how we want to develop the debug content across the Ruby and Rails courses. There are a lot of things we could (and probably should) be showing, even outside of rdbg (how to use the Logger, using the development error page console, etc.)

I'll leave this open though, and when we're ready to green light this, I'll gladly assign you to work on it.

[github-actions]

This issue is stale because it has had no activity for the last 30 days.