1. Debugging with Pry
Michal Oláh
@michalolah
@bonetics

2. Progammers spend 60% of
their time debugging
We should pay attention to
our workflow

4. “There are no fully fledged IDEs for Ruby on
Rails…”
–Agile Web Development with
Rails
-July 2009

5. WTF

6. WTF?

7. WTF?!

8. Actually its not that bad

9. we have
tests after all

10. And puts is a powerfull thing

11. But what if you meet this
guy?

13. Commands
!
binding.pry
play
whereami
edit -c
exit
ls
cd
next, previous, skip, breakpoint (debugger)

14. Demo 1
!
•
debugging integration tests
!
•
fast feedback of what works and what doesn’t

15. Demo 2
!
•
debugging controller action
!
•
ls, cd
!
•
inplace code edit and debug with breakpoints
!
•
edit, breakpoint, whereami, wtf?!
!
•
debugging with pry-rescue

17. Plugins and features
•
pry-debugger (MRI 1.8-1.9)
•
pry-byebug (MRI 2.0+)
•
pry-rescue - resque from exceptions in to a pry
session
•
plymounth - jump into a pry session on test failure
•
pry-rails
•
help command
•
pry custom commands

18. Resources
•
http://pryrepl.org
•
http://gaslight.co/blog/i-like-pry-but-dot-dot-dot
•
http://railscasts.com/episodes/280-pry-with-rails
•
http://www.youtube.com/watch?v=o90CCPjcIKE
•
https://github.com/m1k3/rubyslava_pry_demo