Keynote: The Case Of The Vanished Variable - A Ruby Mystery Story
summary
A grant-assignment bug turns out to be caused by class variables shared up the inheritance chain so three award classes report a combined 300 total instead of separate counts; the immediate fix is deleting a stray reopen that set a class variable to 300 and rerunning the scripts yields correct totals. Investigation uses Git diffs and simple repro scripts, leads to a Ruby core cache for class-variable lookup, landed in Ruby 3.1, and delivers a measured 6–7% Rails request throughput gain.
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chapters (9)
- 0:00Keynote
- 3:52Ruby PI Deidre Buck
- 4:56Vanished variable begins
- 9:28Detective assignment
- 14:04Mystery deepens
- 16:41Hidden sabotage
- 23:42Sabotage plot
- 25:52Ruby internals impact
- 36:54Closing thoughts
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