Pry Cheat Sheet

gistfile1.md

Pry Cheat Sheet

• Youtube Tutorial 2013

Command Line

• pry -r ./config/app_init_file.rb - load your app into a pry session (look at the file loaded by config.ru)
• pry -r ./config/environment.rb - load your rails into a pry session

Debugger

• help ls -- Display command options for pry command ls
• ls <Object> -- Show all of the available methods that can be called by an object
• _ -- Last eval
• ? <Object> -- Shows more information (doc) about an object, or method
• _file_ -- Represent the last file Pry touched
• wtf? -- Print the stack trace, same as _ex_.backtrace
• $ -- Show source, shortcut for show-source
• edit Class -- Open file in $EDITOR
• edit Class#instance_method -- Open file in $EDITOR
• <ctrl+r> -- Search history
• _out_ -- Array of all outputs values, also _in_
• cd <var> -- Step into an object, change the value of self
• cd .. -- Take out of a level
• binding.pry -- Breakpoint
• edit --ex -- Edit the file where the last exception was thrown
• .<Shell> -- Runs the command
• whereami -- Print the context where the debugger is stopped
• whereami 20 -- Print the context 20 lines where the debugger is stopped
• ; -- Would mute the return output by Ruby
• play -l -- Execute the line in the current debugging context

pry-nav

• next -- execute next line
• step -- step into next function call
• continue -- continue through stack

pry-rescue

• rescue rspec -- break on exception in rspec
• rescue rails server -- break on exception in rails server
• try-again -- run last failing spec, reloads the file not the enviornment

Thank you!

Info very helpful,
Thanks!!!!

very helpful, thanks

This is amazing. Thanks!

bookmarked

Thanks for this.

One trick I use all the time is ls -G <search-term> <Object> It greps method names on an object containing the term.

This is pure gold 👌. Thank you so much for this! 😁✌️

Thanks for this! I spent so long trying to find how to skip inspecting the result of a slow command (By adding ; to the end)

For context in case it helps someone:

Model.all.count # Fast

If you break it down by line, Pry wants to inspect the interim step which means serializing every record in your table

q = Model.all # Slow, as it tries to inspect every row in the table
q.count # Fast

So, you can make it quick by skipping output:

q = Model.all; # Fast again
q.count # Fast

What about exit or escape commands? Sometimes you are trapped in a pry inside a loop and want to escape all

If you want to escape out of the program use exit-program or simply !!!

Thanks

…

On Wed, Aug 7, 2019 at 8:18 PM Rexford Borawski ***@***.***> wrote: If you want to escape out of the program use exit-program or simply !!! — You are receiving this because you commented. Reply to this email directly, view it on GitHub <https://gist.github.com/9919357?email_source=notifications&email_token=AEICPPDT372YES2T3SFAK4TQDOF6VA5CNFSM4HPGM4O2YY3PNVWWK3TUL52HS4DFVNDWS43UINXW23LFNZ2KUY3PNVWWK3TUL5UWJTQAFWVVE#gistcomment-2992978>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AEICPPCXR4APG247H4JLQLTQDOF6VANCNFSM4HPGM4OQ> .

-- Regards, Matthew Israelson

I'm inside a giant loop, is there a way to "continue all"? exit! ends up killing rails server altogether.

@gumatias disable-pry will skip all future bindings without killing the server.

thanks!

Much appreciated!

Want to stop the code from running after pry, without quitting the server? I use raise-up

Thanks for this!

very useful!!! Thank you!

Useful

pry-backtrace is a great option for viewing the stack. It will include line numbers where I don't think wtf? does

If you want to make changes to your code while paused with pry, you can type reload-code into your terminal and it will reload the file you're paused in. (Save changes to the file first).

should add @ keyword to the alias of whereami ?