Who contributed to Rails on August 21, 2026?

7 developers shipped this update, including Ryuta Kamizono, ngan, Nick Pezza, rafael-pissardo, wintan1418, Rosa Gutierrez, and jeremy.

What were the notable Rails updates?

Deprecate `ActiveRecord::Relation#uniq!`, Remove `true:` / `false:` options from `ImmutableString` API doc, and Honour TERM received during supervisor boot before forking workers.

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The Wire · Showcase

Rails deprecates Relation#uniq! as Marcel overhauls MIME detection

By RepoJournal · Filed 06:55 UTC on August 21, 2026 · About Rails

7 people shipped this

Ryuta Kamizono @kamipo 2 cited

jeremy @jeremy 2 cited

ngan @ngan 1 cited

Nick Pezza @npezza93 1 cited

rafael-pissardo @rafael-pissardo 1 cited

wintan1418 @wintan1418 1 cited

Rosa Gutierrez @rosa

Rails is cleaning house on legacy ActiveRecord methods while Marcel rewires MIME type handling from the ground up.

Rails deprecated `ActiveRecord::Relation#uniq!` [1], a method that has been redundant since 7.0's automatic deduplication, and removed the internal `true`/`false` options from the `ImmutableString` API docs [2]. Meanwhile, solid_queue fixed a shutdown race where TERM signals sent during boot were dropped, leaving workers claiming jobs until SIGKILL [3], and now ensures terminated forks get replaced even if the database is down [4]. Marcel's new TYPE_ALIASES map [5] resolves 152 aliases so `application/javascript` correctly returns as `text/javascript`. The CR2 detection bug [6] is also fixed: "image/tiff probed at index 23 while the CR2 matcher sat at 125 and never won." SQLite schema reads get batched for faster introspection [7], and solid_cable dropped a now-unnecessary channel index [8].

Action items

→ Remove usage of `ActiveRecord::Relation#uniq!` from your codebase rails/rails [plan]
→ Upgrade solid_queue to include the TERM handling fix rails/solid_queue [immediate]
→ Review Marcel detection behavior for alias and CR2 changes rails/marcel [plan]

References

[1] Deprecate `ActiveRecord::Relation#uniq!` rails/rails
[2] Remove `true:` / `false:` options from `ImmutableString` API doc rails/rails
[3] Honour TERM received during supervisor boot before forking workers ↗ rails/solid_queue
[4] Replace terminated forks even if releasing their claimed jobs fails ↗ rails/solid_queue
[5] Respect MIME type aliases ↗ rails/marcel
[6] Probe common magic types within their priority band ↗ rails/marcel
[7] Read the table options of many tables at once, and batch the SQLite readers ↗ rails/rails
[8] Remove channel index since we use channel_hash now rails/solid_cable

Quick answers

What shipped in Rails on August 21, 2026?: Rails is cleaning house on legacy ActiveRecord methods while Marcel rewires MIME type handling from the ground up. In total, 27 commits and 14 pull requests landed.
Who contributed to Rails on August 21, 2026?: 7 developers shipped this update, including Ryuta Kamizono, ngan, Nick Pezza, rafael-pissardo, wintan1418, Rosa Gutierrez, and jeremy.
What were the notable Rails updates?: Deprecate `ActiveRecord::Relation#uniq!`, Remove `true:` / `false:` options from `ImmutableString` API doc, and Honour TERM received during supervisor boot before forking workers.

Solid Queue ships batches, Marcel slashes detection reads 10x

Solid Queue finally delivers the job-batch feature you've been waiting for, while Marcel undoes a detection-cost regression that made every JPEG probe 10x slower.

ruby 25 shipped

@rails Aug 20

RAILS DIGS INTO OOXML DETECTION AS MARCEL SHIPS BOUNDARY DOCS

Marcel finally explains why callers still need their own serving and parser controls while the team hunts down ZIP central directories to nail OOXML documents.

ruby 47 shipped

@rails Aug 19

SPROCKETS CACHE LIMITS GET AN OFF SWITCH

Sprockets just shipped an escape hatch for environments where the cache cleaner costs more than the cache it protects.

ruby 49 shipped

@rails Aug 18

RELATION#UPDATE IGNORES SCOPE: SILENT CROSS-TENANT WRITES

A one-line fix that closes a silent cross-tenant write hole in Rails' association updates.

ruby 22 shipped

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