The Case Of The Vanished Variable - A Ruby Mystery Story
summary
A debugging story that proves how specifics matter: a grants script awarding 50+30+20 should total 100 but reads back 300 because class variables share across an inheritance chain, a stray reopened Grant sets a class var to 300, and copy‑paste left a hidden overwrite. Investigation uses Ruby and Rails, a prize app StoryGraph with 3M monthly users and 110M requests, and culminates in a Ruby core change — Ruby 3.1 class variable cache — that yields a 6–7% Rails throughput win.
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chapters (11)
- 0:00Start
- 6:06Deirdre Bug
- 6:35CHAPTER ONE
- 11:11CHAPTER TWO
- 16:20CHAPTER THREE
- 22:10CHAPTER FOUR
- 26:25CHAPTER FIVE
- 33:01CHAPTER SIX
- 37:05Learn Ruby
- 37:21Improve Ruby
- 37:51Keep Ruby alive
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