Who contributed to Rails on September 7, 2026?

2 developers shipped this update, including Benoit Daloze and fatkodima.

What were the notable Rails updates?

Use Regexp#source instead of Regexp#to_s to detect deep filters and Merge pull request #58678 from eregon/parameter-filter-regexp-source.

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Sep 7, 2026

$ the-wire · showcase

ActionDispatch drops regexp re-serialization per ParameterFilter build

By RepoJournal · Filed 07:55 UTC on September 7, 2026 · About Rails

2 people shipped this

Benoit Daloze @eregon 1 cited

fatkodima @fatkodima 1 cited

Rails replaced Regexp#to_s with Regexp#source in ParameterFilter#compile_filters!, removing per-call regexp re-serialization and re-compilation overhead on every ActionDispatch request.

ParameterFilter#compile_filters! used Regexp#to_s to check whether pattern text contains an escaped dot, which re-serializes and partially re-compiles the regexp on every call. It now uses Regexp#source, a plain accessor, returning the same answer without the extra work [1]. This matters because ActionDispatch builds a new ParameterFilter per request, so the savings show up in benchmarks like railsbench [1]. The change was merged into Rails via pull request #58678 [2].

Action items

→ Monitor ActionDispatch request overhead in your Rails app after upgrading; this change removes per-request regexp re-serialization. rails/rails [plan]

References

[1] Use Regexp#source instead of Regexp#to_s to detect deep filters ↗ rails/rails
[2] Merge pull request #58678 from eregon/parameter-filter-regexp-source ↗ rails/rails

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

the week in review Rails moves config to class attributes the month in review Rails deepens Ractor safety, ships Marcel 2.0, and retires decade-old APIs

Topics: Ruby Full archive →

Quick answers

What shipped in Rails on September 7, 2026?: Rails replaced Regexp#to_s with Regexp#source in ParameterFilter#compile_filters!, removing per-call regexp re-serialization and re-compilation overhead on every ActionDispatch request. In total, 2 commits and 1 pull requests landed.
Who contributed to Rails on September 7, 2026?: 2 developers shipped this update, including Benoit Daloze and fatkodima.
What were the notable Rails updates?: Use Regexp#source instead of Regexp#to_s to detect deep filters and Merge pull request #58678 from eregon/parameter-filter-regexp-source.

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$ log @rails --recent

2026-09-06 Rails fixes docker-entrypoint to honor extra server flags 8 shipped 2026-09-05 Layouts guide rewritten, Bootsnap 1.26.0 fixes cache corruption 35 shipped 2026-09-04 PostgreSQL triggers stay disabled after failed yield 23 shipped 2026-09-03 Ractor-safe config moves in Rails, Propshaft 34 shipped

$ log --all # elsewhere on the wire

Meta 2026-09-07 React Native adds Stable API guards to renderer attributed string FastAPI & Pydantic 2026-09-07 Pydantic fixes Mypy plugin crash, tightens datetime constraints

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