Everything that breaks upgrading Rails 7.2 to 8.1, and how to fix it: enum syntax, the Solid trifecta, Propshaft, params.expect, and every silent regression.

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A practical guide to upgrading Rails from 7.2 to 8.1, covering every breaking change and how to fix it. Key breaking changes include the enum keyword argument syntax removal (now requires positional syntax), to_time timezone behavior changes, schema.rb column reordering, and leading bracket parameter name parsing. New features covered include the Solid trifecta (Solid Queue, Cache, Cable) as Redis replacements, params.expect for stricter parameter handling, Propshaft as the new default asset pipeline, and the authentication generator. The recommended upgrade strategy uses a dual-boot approach with the next_rails gem on main (not a branch), progressing through preparation, dual boot, cutover, default migration, and optional infrastructure migration phases.

Rails 7.2 to 8.1 Upgrade: What Actually Breaks and How to Fix It

What Breaks in the Rails 7.2 to 8.1 Upgrade