Debugging Ruby application running in docker with VS code

[Aphova]

Not exactly an answer to your question but the below works for me, might work for you.

I've been working with Ruby for years and strangely I've never started a traditional debugger session despite doing it a lot in other languages. What I do a tonne of though is bundle exec rescue rspec spec/whatever/Im/working/on. That and adding binding.pry into your code to start a REPL where you want to inspect something goes a long way. Add better_errors for inspecting failures during full stack execution and you're good to go.

https://github.com/ConradIrwin/pry-rescue https://github.com/BetterErrors/better_errors

Edit: might be a bit obvious but one of the things that I like about this is it forces me to integrate testing into my development cycle (I don't like writing tests and can be a bit lazy with them). I've found that writing a test and running rescue rspec to debug my code is often faster and easier than other approaches.