November 2008
Beginner
448 pages
12h 25m
English
Content preview from Learning RailsBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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The Ruby Debugger
The console is fun for tinkering and can be extremely useful for trying things out, but it’s a completely separate process from the way you (and your users) normally run Rails applications.
Note
Unfortunately, Heroku does not appear to support the Ruby debugger at the time of writing. Hopefully it will appear eventually.
If you do a search on Rails debugging, you’ll find lots of information on the Rails breakpointer. Unfortunately, the breakpointer depended on a bug in Ruby itself, one that was fixed in Ruby 1.8.5, so the breakpointer is now defunct. Instead, the most common current approach uses the Ruby debugger. It’s installed as a gem called ruby-debug. From the command line, you can install it with:
$ sudo gem install ruby-debug
Password:
Building native extensions. This could take a while...
Building native extensions. This could take a while...
Successfully installed linecache-0.43
Successfully installed ruby-debug-base-0.10.1
Successfully installed ruby-debug-0.10.1
3 gems installed
Installing ri documentation for linecache-0.43...
Installing ri documentation for ruby-debug-base-0.10.1...
Installing ri documentation for ruby-debug-0.10.1...
Installing RDoc documentation for linecache-0.43...
Installing RDoc documentation for ruby-debug-base-0.10.1...
Installing RDoc documentation for ruby-debug-0.10.1...If you’re on Windows or certain Linux installs, the sudo part may be unnecessary.
Note
If you get a “Can’t find header files for ruby” error message, your Ruby ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.