Active Model drops Ruby 4.3 alias, breaking nightly

By RepoJournal · composed from the cited sources · human-reviewed weekly · methodology

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Rails nightly against ruby 4.1.0dev has failed since September 17 in every framework that loads Active Model.

95 commits 48 PRs merged 5 releases 7 briefings covered

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Avoid aliasing `Kernel#respond_to?` in `ActiveModel::AttributeMethods` rails/rails

by yahonda

Nightly runs against ruby 4.1.0dev began failing on 2026-09-17, starting at active_model/attribute_methods.rb:563 with a warning about the fallback to Kernel#respond_to?. The change stops aliasing Kernel#respond_to? inside ActiveModel::AttributeMethods, which is the piece every framework loading Active Model inherits.

Avoid materializing `descendants` when resolving an STI subclass rails/rails

by Vadim Hvistik

find_sti_class guarded the resolved class with descendants.include?(subclass), and descendants is not memoized: each call walks Class#subclasses recursively, allocating two arrays per node, then scans the result linearly. Resolving an STI subclass no longer pays that cost.

Fix BroadcastLogger#tagged when broadcasting to multiple tagging loggers rails/rails

by ousamabenyounes

The logger did not define #tagged, so calls fell through to method_missing, which breaks whenever more than one broadcast target supports tagging (issues #49757 and #49745, including the block form). One fix for both the plain and block-form call paths.

Drop the explicit SET FOREIGN_KEY_CHECKS statements from MySQL `db:schema:load` rails/rails

by Yasuo Honda

structure_load ran SET FOREIGN_KEY_CHECKS = 0 before loading, a line dating from the first Rails commit, when Rails wrote the file itself from SHOW CREATE TABLE output. MySQL schema:load no longer emits it.

Use standard input for MySQL `db:schema:load` rails/rails

by Yasuo Honda

MySQL 9.4.0 added the --commands option to the mysql client; it is off by default across the 9.x and 26.x series including 9.7 LTS, and disabling it turns off local commands like source, which broke schema_format = :sql. The loader now feeds the schema over standard input instead.

$ ls rails/week/ # the briefings behind this review

Mon Sep 21 Active Model drops a Ruby 4.3 deprecation, Rails tests unbreak on libxml2 2.14 Tue Sep 22 BroadcastLogger#tagged fixed, STI subclass lookup stops materializing descendants Wed Sep 23 MySQL schema:load fixes, Server-Timing nested event fix, and Rails World 2026 agent benchmarks Thu Sep 24 GPT-6 Luna results land in Rails evals, site, and devcontainer gets Ruby 3.4.11 Fri Sep 25 Herb becomes the 8.2 default, Ractor-safe connections land Sat Sep 26 BigInteger casting truncation fixed, Rails guides rewritten Sun Sep 27 Rails dump skips extension-owned objects, solid_cable 4.1 adds encryption