How can I force Ruby to show a full stack trace?

Question

I just got this error message:

...
from c:/ruby/lib/ruby/gems/1.8/gems/...
 ... 10 levels...
from c:/ruby/lib/ruby/gems/1.8/gems/...
...

and the bug (of course) is hidden somewhere in ... 10 levels....

score 94 · Accepted Answer · edited Jan 02 '20 at 15:50

94

begin
  # Code that raises exception
rescue StandardError => e
  puts e.backtrace
end

edited Jan 02 '20 at 15:50

Peter Mortensen

answered Dec 19 '08 at 11:37

Željko Filipin

8

How do you show the stacktrace without catching an exception? Just in normal operation, that is. – Chirag Patel Jun 30 '11 at 14:56
9

@ChiragPatel, maybe you want to use [Kernel#caller](http://www.ruby-doc.org/core-1.8.7/Kernel.html#method-i-caller). – Sony Santos Jan 02 '12 at 16:06
3

Kernel#caller, as Sony Santos mentioned, is absolutely the way to go for what you are wanting. It will return an array of strings. You could easily just do something like the following to get a neat stack trace in your log: Rails.logger.info caller.join("\n") – slant Dec 31 '12 at 20:13
3

By default rescue handles **StandardError** not **Exception**. So you should rather rescue StandardError. See https://robots.thoughtbot.com/rescue-standarderror-not-exception. – DanT Mar 18 '15 at 13:29

1 Answers1