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Rails 8.1 removed the ExplainSubscriber class (commit f488878f1bc), causing test failures with: NameError: uninitialized constant ActiveRecord::ExplainSubscriber The ExplainSubscriber functionality was refactored into ExplainRegistry with lazy subscription - instead of subscribing at initialization, Rails 8.1 now subscribes only when .explain is first called via ExplainRegistry.start. The spec_helper.rb line that manually subscribed to ExplainSubscriber is no longer needed or valid. Rails 8.1 handles the subscription automatically and lazily. Related Rails commit: - f488878f1bc "Refactor ExplainRegistry to only be subscribed once used" - Author: Jean Boussier - Date: Thu Sep 25 10:37:09 2025 +0200 - Link: rails/rails@f488878
Switch from pre-release alpha constraint to stable release constraint for ActiveRecord 8.1.0 dependency, following Rails 8.1 stable release.
Document Rails 8.1 support with installation instructions, including the gem version constraint for activerecord-oracle_enhanced-adapter 8.1.
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This PR is a sister PR to #2480, containing the same Rails 8.1 compatibility changes but without the CLOB-related fixes. This allows for separate review of the core Rails 8.1 API changes.
Relationship to Other PRs
Recommendation
While this PR can be merged independently, I strongly recommend also including #2485 and #2486 in the 8.1 release. Rails 8.1 changes
prepared_statementsdefaults in ways that will exacerbate CLOB insertion issues for users who haven't explicitly configured this setting.Changes Included
All core Rails 8.1 API compatibility fixes from @akostadinov's work in #2471:
dump_schema_information→dump_schema_versionsWhat's NOT Included
The CLOB/BLOB fixes from #2485 and #2486:
before_create/after_createcallbacks for LOB writesCredits
The vast majority of this work was done by Aleksandar N. Kostadinov (@akostadinov) and Daria Mayorova (@mayorova) in PR #2471.
Testing
CI will verify tests pass against Rails 8.1 (8-1-stable branch).