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Upgrade Rails 7.1 -> 7.2 #883

Description

@suttondemlong

Why

First framework step. With the prep and the two blocker gems done, this should be close to mechanical. Verified to resolve cleanly.

Scope

  • gem "rails", "~> 7.2.0"
  • Keep config.load_defaults at 7.1. Run bin/rails app:update, take the generated new_framework_defaults_7_2.rb with every option still commented. Enabling them is a separate issue — upgrading the framework and changing its behaviour are two different changes, and some defaults alter serialization formats that must not flip in the same deploy.
  • config/initializers/new_framework_defaults_7_1.rb can be retired: it is already fully worked through and load_defaults 7.1 is set, so it is bookkeeping.
  • Rails.application.secrets is removed in 7.2 — already handled by the prep issue.

Note Rails 7.2 requires Ruby >= 3.1, so this lands fine on the current Ruby 3.2.3.

Acceptance criteria

  • Full suite green with deprecations raising
  • load_defaults still 7.1
  • Staging soak before the defaults are flipped

Blocked by

#881 (Mongoid 9) and #882 (Globalize 7) — both hard resolution blockers. Blocks #884 and #885.


Part of the Ruby + Rails upgrade sequence. Ruby 3.2 reached end of life on 2026-04-01 and the backend is on Rails 7.1; the goal is Ruby 3.4.10 and Rails 8.1, in steps that each keep CI green and are independently deployable.

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