Who contributed to Rails on May 16, 2026?

5 developers shipped this update, including moberegger, seanpdoyle, bert-mccutchen, taketo1113, and JoelTowell.

What were the notable Rails updates?

v2.15.0, Optimize `array!` and `set!`, and Revert "Add default `#render_in` implementation to `ActiveModel::Conversion`".

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The Wire · Showcase

JBUILDER CUTS MEMORY WITH OPTIMIZATION SUITE

By RepoJournal · Filed 06:00 UTC on May 16, 2026 · About Rails

5 people shipped this

moberegger @moberegger 1 cited

seanpdoyle @seanpdoyle 1 cited

bert-mccutchen @bert-mccutchen 1 cited

taketo1113 @taketo1113 1 cited

JoelTowell @JoelTowell 1 cited

Jbuilder 2.15.0 shipped performance wins across the entire rendering pipeline while Rails core quietly reverted two incomplete features headed for 8.2.

The Jbuilder team landed a focused optimization sprint that reduces memory allocations in `array!` and `set!` calls by eliminating unnecessary splat operations, while also optimizing the `KeyFormatter` cache path [1][2]. Over on rails/rails, the team reverted an incomplete `ActiveModel::Conversion#render_in` implementation after discovering it didn't properly handle controller-based view namespacing, which was never released so the revert is clean [3][4]. A second revert addressed schema column sorting in dumps, which the core team determined wasn't the right approach to the underlying problem [5]. Meanwhile, Jbuilder also aligned scaffold generation with Rack 3.1's HTTP 422 status code change from `:unprocessable_entity` to `:unprocessable_content` [6]. Thor fixed false positive warnings from mock frameworks that were polluting test output by distinguishing between user-defined and gem-defined methods [7].

Action items

→ Update to Jbuilder 2.15.0 for performance gains in collection rendering rails/jbuilder [plan]
→ Review any custom render_in implementations before Rails 8.2 final rails/rails [monitor]
→ Update Thor to suppress test framework warnings rails/thor [plan]

References

[1] v2.15.0 ↗ rails/jbuilder
[2] Optimize `array!` and `set!` ↗ rails/jbuilder
[3] Revert "Add default `#render_in` implementation to `ActiveModel::Conversion`" ↗ rails/rails
[4] Merge pull request #57374 from seanpdoyle/revert-pr-57349 rails/rails
[5] Revert: Sort table columns by name when dumping schema ↗ rails/rails
[6] Use `:unprocessable_content` for scaffolds with Rack 3.1 or higher ↗ rails/jbuilder
[7] Suppress false positive warnings from gem-defined methods ↗ rails/thor

Quick answers

What shipped in Rails on May 16, 2026?: Jbuilder 2.15.0 shipped performance wins across the entire rendering pipeline while Rails core quietly reverted two incomplete features headed for 8.2. In total, 21 commits, 15 pull requests, and 1 releases landed.
Who contributed to Rails on May 16, 2026?: 5 developers shipped this update, including moberegger, seanpdoyle, bert-mccutchen, taketo1113, and JoelTowell.
What were the notable Rails updates?: v2.15.0, Optimize `array!` and `set!`, and Revert "Add default `#render_in` implementation to `ActiveModel::Conversion`".

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