Learn how to use ruby/debug

This talk Show archive.org snapshot shows simple and advanced usages of the ruby/debug Show archive.org snapshot debugger. It goes through a step by step debugging workflow.

Here are some command examples:

(rdbg) step 2 # step twice
(rdbg) info # show current scope, including self
(rdbg) bt # show backtrace
(rdbg) frame 3 # go directly to frame 3
(rdbg) break User#email # add a breakpoint in the email instance method
(rdbg) catch SomeException # break when SomeException is raised

Some advanced examples for scriptable breakpoints:

debugger(pre: "info ;; puts @foo ;; info ;; bt ;; break @user.name") # starts debugging session after executing each of the pre commands 
debugger(do: "break @user.name ;; pre info") # runs commands and continues immediately afterwards, breaking in `@user.name` and running info at the breakpoint