Sorbet at Grailed: Typing a Large Rails Codebase to Ship with...
summary
Grailed types a 150,000‑line Rails monolith with Sorbet to reduce nil errors and refactor fear, serving over 7 million users. Tooling includes Tapioca for RBI generation, Sorbet Rails for ActiveRecord signatures and a custom RBI generator using Parlor for service objects; runtime mismatches post‑deployment send Slack alerts rather than raising exceptions. Adoption reaches about 70% of calls typed while only ~8% of files remain untyped, and Dry Monads largely gets replaced.
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chapters (13)
- 0:00Start
- 2:30Changes
- 8:06Signature Types
- 13:02RBI's (Ruby Interface Files)
- 15:32Exhaustiveness checking with Enum
- 18:48First steps
- 20:33Evangelize and Enforce
- 21:51Type your Dynamic Code: Service Objects at Grailed
- 22:59Type your Dynamic Code: Breaking Things
- 23:54Type your Dynamic Code: Parlour to the Rescue
- 24:50Removing Dynamic Code
- 25:23Replace Result Monad with Type union
- 26:37Challenges We Still Face
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