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I'm debugging a Rails application that uses gems from my local environment. Is there a way to place a breakpoint in one of the gem's file and have it trigger when I debug my app ?

htatche
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  • So it seems that the debug process does trigger as I get a REPL on the Debug Console, but none of the IDE bells and whistles like Call Stack / Variables state show up. – htatche Dec 03 '19 at 11:45

2 Answers2

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How can I see the source code of a gem installed on my machine? should help you

If you need to edit the source code of say Devise, you would run:

bundle open devise

This will open the gem in your default text editor, allowing you to put breakpoints wherever needed.

Alternatively to see where it's stored on your machine try:

bundle show devise

Mark
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  • I know how to browse my gem and add a breakpoint. My issue is that when it hits the line the debug process doesn't trigger properly. – htatche Dec 03 '19 at 11:44
  • Sorry I wasn't clear enough with my question. I've added a comment underneath. Thanks for helping out anyway ! – htatche Dec 03 '19 at 11:47
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    No worries, I think the standard REPL is the most you can get from a pry point inside an engine but not 100% sure – Mark Dec 03 '19 at 11:49
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You can use gem 'pry-rescue' and gem 'pry-rails' in your gemfile to debbug your code. Just put in your group development like this:

group :development do gem 'pry-rails' gem 'pry-rescue' end

in your code you can put binding.pry

and after that just run your application and your request will stop where you put the binding.pry

henrich jones
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