The Case of the Missing Method: A Ruby Mystery Story
summary
A debugging detective story that proves the concrete claim: that what look like class methods live on an object's singleton class, not on its superclass. Reproductions use pry and IRB, an object_space probe that shows class creation increments by two, and a small "where" routine that walks ancestors to locate methods. A DSL example builds per-city behavior by adding methods into instance singleton classes. Useful if encountering mysterious method lookup or Rails/DSL magic.
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chapters (12)
- 0:00Introduction to the mystery
- 1:55Mike’s urgent request
- 6:31First investigation dead end
- 8:16Fresh leads at coworking space
- 10:26Smalltalk lecture breakthrough
- 13:40Solving the case for Mike
- 14:44Learning about singleton classes
- 16:29Ellen’s DSL demonstration
- 21:33Why singleton classes matter
- 24:21Jenny’s betrayal revealed
- 25:47Empowering Mike with knowledge
- 26:09Two months later update
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