The Interactive Ruby Shell, or IRB, doesn’t have a way to clear all variables that I am aware of besides quitting irb and then restarting irb however you can simulate this by invoking subirbs. Subirbs are jobs underneath the main irb session that will allow you to work within irb on different code at the…
The Interactive Ruby Shell, or irb, is a great tool to use when debugging Ruby code. You can launch it from a shell window and quickly determine where errors in your Ruby code. Obviously irb is not always the best tool to use when debugging a large code base however for quick hints to where errors…
When debugging Rails, I often open up an iRb shell by typing [BASH] ruby script/console [/BASH] This command lists all instance methods in the User model, excluding inherited methods and sorts them in alphabetical order. [BASH] User.instance_methods(false).sort [/BASH] I will add more useful iRb methods as I discover and remember them
If you want to dynamically add a member to a Ruby object, use the hash/array brackets and symbol (:user_id) as shown in the iRb session below. As you can see the dot notation will not work. bash >> d = AccessMode.find(1) => #<AccessMode id: 1, device_id: 31218, mode: "dialup", timestamp: "2007-12-25 15:52:55"> >> d[:user_id] =…
Error: /usr/local/lib/ruby/1.8/irb/completion.rb:10:in `require’: no such file to load — readline (LoadError) When attempting to run irb you get the above error.
This is what I had to do to get it to work on CentOS 5. For some reason, FreeType would not work with yum so I built it from scratch. I’m not sure if the all the “yum install”s were needed, but I did it anyway. #yum install freetype — did not work cd /usr/local/src…