This week in Rails covers a broad set of changes to the Rails codebase. Key highlights include Action Cable server adapterization that separates socket handling and transport-specific behavior into abstractions, enabling alternative server implementations. Other changes include Ractor shareability shims added to Kernel, improved exception wrapper configuration, a new `default_order` query method for Active Record associations, better error messages for `insert_all`/`upsert_all` key mismatches and enum invalid values, fixes for Active Record Pool Reaper thread leaks after parallelized tests, a fix for `create_join_table` to accept a primary key (useful for PostgreSQL logical replication), and various bug fixes across Action Mailbox, Active Storage, and Active Job. 47 contributors participated this week.
