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wire 2026-08-21
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Rails deprecates Relation#uniq! as Marcel overhauls MIME detection

By RepoJournal · Filed · About Rails · Composed from the cited sources · methodology

Ryuta Kamizono jeremy ngan Nick Pezza rafael-pissardo wintan1418 Rosa Gutierrez
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

References

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

$ ls rails/reviews/ # the step-back reads

the week in review Ractor-ready Active Record and Active Job land in Rails the month in review Herb becomes Rails 8.2 default
Full archive → Weekly reviews →

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.
♥

$ log @rails --recent

Attribute-read regression fixed, decimal numericality corrected 79 shipped in_order_of double-serializes values, id_value alias restored 50 shipped Inlined attribute writers, leaner ActiveRecord::Key 31 shipped MySQL 5.6 falls off the support floor as Arel stops rebuilding literals 27 shipped

$ log --all # elsewhere on the wire

Alignment & Post-training verl standardizes low-precision rollout kernels on DeepGEMM Agent Security Guardrails exposes hooks over HTTP, certifi floor raised in agent-scan

$ ls showcases/

Safety Evals AI Red Teaming Agent Security Interpretability Alignment & Post-training

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