What were the notable Rails updates?

Raise on ignored if_exists option in change_table remove_timestamps, Make add_index/remove_index if_(not_)exists reversible, and Fix incorrect number_to_percentage default precision in docs [ci skip].

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RAILS TIGHTENS MIGRATION REVERSIBILITY AND TIMESTAMPS VALIDATION

By RepoJournal · Filed 06:00 UTC on July 5, 2026 · About Rails

Two critical migration fixes landed overnight that prevent silent failures when rolling back idempotent operations, plus stricter validation for ignored options in change_table blocks.

Rails now raises ArgumentError when remove_timestamps receives if_exists or if_not_exists options it cannot honor, closing the last gap in change_table validation [1]. Previously every other column-altering helper in change_table raised on ignored conditional options, but remove_timestamps quietly dropped them and proceeded anyway, masking developer intent during migrations.

Inversion of add_index and remove_index now correctly translates conditional modifiers so rollbacks stay idempotent [2]. The bug meant inverting add_index with if_not_exists carried the wrong option to the generated remove_index, and rolling back remove_index with if_exists lost its safety modifier entirely. Both scenarios would explode on replay if the index state didn't match the original migration attempt.

On the lighter side, Rails added this_quarter? to Date and Time [4], completing the predicate family alongside this_week?, this_month?, and this_year?. Also landed: documentation fix clarifying that number_to_percentage defaults to 3 decimal places, not 2 [3], bringing docs in line with actual behavior.

Action items

→ Review migrations using remove_timestamps with conditional options and add error handling for any that do rails/rails [plan]
→ Audit rollback tests for add_index/remove_index migrations to confirm idempotency works correctly rails/rails [plan]

References

[1] Raise on ignored if_exists option in change_table remove_timestamps rails/rails
[2] Make add_index/remove_index if_(not_)exists reversible rails/rails
[3] Fix incorrect number_to_percentage default precision in docs [ci skip] rails/rails
[4] Add this_quarter? to Date/Time rails/rails

Quick answers

What shipped in Rails on July 5, 2026?: Two critical migration fixes landed overnight that prevent silent failures when rolling back idempotent operations, plus stricter validation for ignored options in change_table blocks. In total, 22 commits and 13 pull requests landed.
What were the notable Rails updates?: Raise on ignored if_exists option in change_table remove_timestamps, Make add_index/remove_index if_(not_)exists reversible, and Fix incorrect number_to_percentage default precision in docs [ci skip].

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