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Pry Cheat Sheet

Pry Cheat Sheet

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
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