What were the notable Rails updates?

Fix ActionController::Live streams hanging on client disconnect, Merge pull request #58050 from 55728/fix-remove-foreign-key-if-exists-name, and Merge pull request #58040 from 55728/fix-cpk-destroy-update-empty-array.

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The Wire · Showcase

RAILS FIXES STREAMING HANG ON CLIENT DISCONNECT, TACKLES FOREIGN KEY EDGE CASES

By RepoJournal · Filed 06:00 UTC on July 8, 2026 · About Rails

ActionController::Live streams were leaving reader threads blocked indefinitely when clients disconnected fast - Rails just fixed the race condition that's been haunting production deploys.

The critical fix [1] patches a threading deadlock in ActionController::Live where the abort handler was clearing the queue without enqueuing the nil terminator that the consumer loop needs to exit. This is a production footgun for any app streaming responses to flaky clients. The fix lands alongside a batch of precision corrections across the ORM: foreign key removal now properly forwards identifying options when using if_exists [2], composite primary key destroy operations treat empty id arrays as empty sets instead of nooping [3], and DISTINCT now applies correctly to average aggregations [4]. Rails also expanded range field tag support to handle endless and beginless ranges [5], closing a gap in numeric form helpers. Nothing earth-shaking, but this is the kind of Tuesday where core behavior gets incrementally more reliable.

Action items

→ If you use ActionController::Live for streaming responses, cherry-pick the abort fix [ref:2] into your next patch release rails/rails [immediate]
→ Verify your foreign key migrations work with if_exists after pulling the latest [ref:1] rails/rails [plan]
→ Test composite primary key destroy logic if you're using CPK in production [ref:4] rails/rails [monitor]

References

[1] Fix ActionController::Live streams hanging on client disconnect rails/rails
[2] Merge pull request #58050 from 55728/fix-remove-foreign-key-if-exists-name rails/rails
[3] Merge pull request #58040 from 55728/fix-cpk-destroy-update-empty-array rails/rails
[4] Merge pull request #58041 from 55728/fix-distinct-average rails/rails
[5] Merge pull request #58039 from 55728/fix-number-field-tag-endless-range rails/rails

Quick answers

What shipped in Rails on July 8, 2026?: ActionController::Live streams were leaving reader threads blocked indefinitely when clients disconnected fast - Rails just fixed the race condition that's been haunting production deploys. In total, 26 commits and 13 pull requests landed.
What were the notable Rails updates?: Fix ActionController::Live streams hanging on client disconnect, Merge pull request #58050 from 55728/fix-remove-foreign-key-if-exists-name, and Merge pull request #58040 from 55728/fix-cpk-destroy-update-empty-array.

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