readable output in rails script/breakpointer
Posted on Sat May 06 16:24:00 UTC 2006
After hours spent in breakpointer struggling to make sense of the output, I figured there had to be a better way to look at a stack trace than what the default output provides:
irb(ArticlesController):007:0> caller
=> [“./vendor/rails/railties/lib/breakpoint.rb:512:in `breakpoint’”, “./vendor/rails/railties/lib/breakpoint.rb:512:in `breakpoint’”, “./vendor/rails/actionpack/lib/action_controller/caching.rb:510:in `cache_sweeper’”, “./app/controllers/articles_controller.rb:7”, …]
Well, after some research, I found at least 4! And they work for any data structure, not just for stack traces, but I’m a pretty happy camper just with cleaner stack traces!
Solution #1
Building on Using the standard output in breakpointer, you can use each to get a more decent output.
caller.each { |x| client.puts x }
which returns:
./vendor/rails/railties/lib/breakpoint.rb:512:in `breakpoint’
./vendor/rails/railties/lib/breakpoint.rb:512:in `breakpoint’
./vendor/rails/actionpack/lib/action_controller/caching.rb:510:in `cache_sweeper’
…
Solution #2
Use PrettyPrint
client.require ‘pp’
client.pp caller
Solution #3
Use YAML
client.require ‘yaml’
client.y caller
Solution #4
Use to_yaml
client.puts caller.to_yaml
These methods can also be used to display any complex data.
Try it on the request object for example.
To avoid having to type the require each time, add to .irbrc:
require ‘yaml’
require ‘pp’
Can't you just do: puts caller Puts automatically prints array elements on separate lines.
Good point. Should have thought of that one. In breakpointer, you would do: client.puts caller to get the output in breapointer itself Thank you, Jules.