rails/rails — a map by here-be-dragons activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb ⇄ activerecord/lib/active_record/connection_adapters/sqlite3_adapter.rb: changed together in 129 commits activemodel/lib/active_model/validations/exclusion.rb ⇄ activemodel/lib/active_model/validations/inclusion.rb: changed together in 38 commits activestorage/lib/active_storage.rb ⇄ activestorage/lib/active_storage/engine.rb: changed together in 40 commits activerecord/lib/active_record/attribute_methods/read.rb ⇄ activerecord/lib/active_record/attribute_methods/write.rb: changed together in 48 commits guides/bug_report_templates/action_controller.rb ⇄ guides/bug_report_templates/active_record.rb: changed together in 30 commits activerecord/lib/active_record/associations/builder/has_many.rb ⇄ activerecord/lib/active_record/associations/builder/has_one.rb: changed together in 30 commits actionpack/lib/action_controller.rb ⇄ actionpack/lib/action_controller/base.rb: changed together in 42 commits actioncable/app/javascript/action_cable/connection.js ⇄ actioncable/app/javascript/action_cable/connection_monitor.js: changed together in 25 commits activemodel/lib/active_model/validations/exclusion.rb ⇄ activemodel/lib/active_model/validations/format.rb: changed together in 24 commits activestorage/lib/active_storage/attached/many.rb ⇄ activestorage/lib/active_storage/attached/one.rb: changed together in 18 commits activemodel/lib/active_model/validations/format.rb ⇄ activemodel/lib/active_model/validations/inclusion.rb: changed together in 24 commits activemodel/lib/active_model/validations/confirmation.rb ⇄ activemodel/lib/active_model/validations/presence.rb: changed together in 22 commits activerecord/lib/active_record/associations/builder/belongs_to.rb ⇄ activerecord/lib/active_record/associations/builder/has_one.rb: changed together in 30 commits activemodel/lib/active_model/validations/format.rb ⇄ activemodel/lib/active_model/validations/presence.rb: changed together in 21 commits activemodel/lib/active_model/validations/acceptance.rb ⇄ activemodel/lib/active_model/validations/confirmation.rb: changed together in 23 commits activemodel/lib/active_model/validations/acceptance.rb ⇄ activemodel/lib/active_model/validations/presence.rb: changed together in 21 commits activerecord/lib/active_record/associations/builder/association.rb ⇄ activerecord/lib/active_record/associations/builder/has_one.rb: changed together in 28 commits guides/bug_report_templates/action_controller.rb ⇄ guides/bug_report_templates/active_job.rb: changed together in 19 commits guides/bug_report_templates/active_job.rb ⇄ guides/bug_report_templates/active_record.rb: changed together in 19 commits activesupport/lib/active_support/message_encryptor.rb ⇄ activesupport/lib/active_support/message_verifier.rb: changed together in 29 commits activerecord/lib/active_record/associations/belongs_to_association.rb ⇄ activerecord/lib/active_record/associations/belongs_to_polymorphic_association.rb: changed together in 27 commits activerecord/lib/active_record/associations/builder/association.rb ⇄ activerecord/lib/active_record/associations/builder/collection_association.rb: changed together in 29 commits actionview/lib/action_view/helpers/tags/collection_check_boxes.rb ⇄ actionview/lib/action_view/helpers/tags/collection_radio_buttons.rb: changed together in 17 commits activemodel/lib/active_model/validations/acceptance.rb ⇄ activemodel/lib/active_model/validations/format.rb: changed together in 21 commits activemodel/lib/active_model/validations/exclusion.rb ⇄ activemodel/lib/active_model/validations/presence.rb: changed together in 19 commits actioncable/app/javascript/action_cable/connection.js ⇄ actioncable/app/javascript/action_cable/subscriptions.js: changed together in 20 commits activemodel/lib/active_model/validations/format.rb ⇄ activemodel/lib/active_model/validations/length.rb: changed together in 23 commits activerecord/lib/active_record/database_configurations/database_config.rb ⇄ activerecord/lib/active_record/database_configurations/hash_config.rb: changed together in 20 commits Rhamir the Restless Vexthrax the Tangled Vexigoth the Many-Handed Oruthas the Colossal Thradrake the Many-Handed Xairion the Entwined Myremir the Restless Rhaugoth the Colossal Mormir the Tangled Vorunyx the Tangled ACTIVERECORD GUIDES ACTIONPACK ACTIVESUPPORT RAILTIES ACTIONVIEW ACTIVEMODEL ACTIVESTORAGE ACTIVEJOB ACTIONCABLE ACTIONTEXT base.rb action_cable.js The Undefined Deep Gulf of Deprecation The Null Ocean Bay of Breaking Changes HERE BE DRAGONS The Realm of rails rails/rails · charted from 60,000 commits · 2009–2026 4,460 settlements · 574k lines · 6,053 souls · 10 dragons GREAT HOUSES House Xavier Noria House Rafael Mendonça França House Ryuta Kamizono House Aaron Patterson House Jon Leighton House Jean Boussier LEGEND Dragon: complex code that keeps changingMountains: deeply nested codeForest: untouched for 2+ yearsMarsh: TODO & FIXMEWalls: has testsRuins: its keeper is away (6+ months)Hatched: forged by AI agentsRoad: files that change togetherBorder: top-level directory N