Ruby on Rails Knowledge Patch

Covers Rails 8.0–8.1 changes. Training cutoff: Rails 7.1, Ruby 3.3.

Index

Topic	Reference	Key features
Rails 8.0 architecture	references/rails-8-architecture.md	Solid Queue/Cache/Cable, Kamal 2, Propshaft, auth generator, Turbo morphing
Active Record queries & schema	references/active-record-queries.md	params.expect, pluck hash, UPDATE with JOIN, first/last deprecation, schema sorting
Active Record columns & serialization	references/active-record-columns.md	only_columns, update_column touch, serialized comparable, JSON coder, PG 18 virtual columns
Database configuration	references/database-config.md	Connection pool options, transaction isolation, SQLite extensions, invisible indexes
Active Job continuations	references/active-job-continuations.md	Resumable multi-step jobs with cursor tracking
Tooling & framework	references/tooling.md	Local CI, credentials:fetch, structured events, markdown rendering, deprecated associations
Deprecations & removals	references/deprecations.md	sidekiq adapter, ActiveSupport::Configurable, mb_chars, Active Storage Azure

Rails 8.0 removes external dependencies: