Who contributed to Rails on August 6, 2026?

8 developers shipped this update, including Donal McBreen, Kenta Ishizaki, jsaubry, Cam Allen, skipkayhil, jeremy, Jean Boussier, and dependabot.

What were the notable Rails updates?

Pluck from the target when the owner is a new record, Serialize continuation step cursors through Active Job arguments, and Add query predicate hooks for Active Record types.

@rails

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The Wire · Showcase

RAILS FIXES PLUCK REGRESSION, BOOTSNAP DITCHES MARSHAL FOR MSGPACK

By RepoJournal · Filed 06:55 UTC on August 6, 2026 · About Rails

8 people shipped this

Donal McBreen @djmb 1 cited

Kenta Ishizaki @55728 1 cited

jsaubry @jsaubry 1 cited

Cam Allen @camallen 1 cited

skipkayhil @skipkayhil 1 cited

jeremy @jeremy

Jean Boussier @byroot

dependabot @dependabot

Rails patched a critical regression in association plucking for new records that broke `ids` queries overnight, while bootsnap replaced Date marshalling with faster, more compact msgpack serialization.

The pluck regression [1] hit after Rails delegated `Relation#ids` to `pluck`, causing associations on unsaved records to return empty arrays instead of reading their in-memory target. A post with tags assigned but not yet persisted would now report zero IDs. The fix reads the target directly for new records, restoring the pre-regression behavior. In parallel, Rails shipped two critical Active Job fixes: cursor serialization [2] now routes through `ActiveJob::Arguments` to preserve non-primitive types like Date and TimeWithZone across interrupt-resume cycles, and prepared statement handling [4] no longer forces preparation when the caller didn't request it, fixing transaction-pooling proxy incompatibilities. Bootsnap's msgpack overhaul [5] replaces Date marshalling with a three-integer packer that's more compact and faster without touching Marshal, part of a broader shift away from serialization that creates security surface. Rails also shipped internal predicate-builder hooks [3] for Active Record types to customize how attributes appear in hash predicates.

Action items

→ Upgrade rails to pick up pluck regression fix if you use association.ids on new records rails/rails [immediate]
→ Review Active Job cursor serialization if you use continuation steps with Date/Time types rails/rails [plan]
→ Update bootsnap to leverage msgpack serialization improvements for startup time rails/bootsnap [monitor]

References

[1] Pluck from the target when the owner is a new record rails/rails
[2] Serialize continuation step cursors through Active Job arguments rails/rails
[3] Add query predicate hooks for Active Record types ↗ rails/rails
[4] Fixes #58371 rails/rails
[5] Replace Date Marshalling with recursive msgpack ↗ rails/bootsnap

Quick answers

What shipped in Rails on August 6, 2026?: Rails patched a critical regression in association plucking for new records that broke `ids` queries overnight, while bootsnap replaced Date marshalling with faster, more compact msgpack serialization. In total, 26 commits and 14 pull requests landed.
Who contributed to Rails on August 6, 2026?: 8 developers shipped this update, including Donal McBreen, Kenta Ishizaki, jsaubry, Cam Allen, skipkayhil, jeremy, Jean Boussier, and dependabot.
What were the notable Rails updates?: Pluck from the target when the owner is a new record, Serialize continuation step cursors through Active Job arguments, and Add query predicate hooks for Active Record types.

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ruby 35 shipped

@rails Aug 4

Rails fixes composite foreign key tracking across counter cache and autosave

Belongs_to associations with aliased or composite foreign keys were silently failing change detection, breaking counter cache increments, touch callbacks, and validation.

ruby 25 shipped

@rails Aug 3

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A performance optimization from Rails 4.2 has been quietly breaking alias_attribute in associations for years, and it's finally fixed.

ruby 23 shipped

@rails Aug 2

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ruby 29 shipped

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