/usr/lib/ruby/vendor_ruby/rails/generators/active_record/ is in ruby-activerecord-3.2 3.2.16-1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/ruby/vendor_ruby/rails/generators/active_record/migration/
/usr/lib/ruby/vendor_ruby/rails/generators/active_record/migration.rb
/usr/lib/ruby/vendor_ruby/rails/generators/active_record/migration/migration_generator.rb
/usr/lib/ruby/vendor_ruby/rails/generators/active_record/migration/templates/
/usr/lib/ruby/vendor_ruby/rails/generators/active_record/migration/templates/migration.rb
/usr/lib/ruby/vendor_ruby/rails/generators/active_record/model/
/usr/lib/ruby/vendor_ruby/rails/generators/active_record/model/model_generator.rb
/usr/lib/ruby/vendor_ruby/rails/generators/active_record/model/templates/
/usr/lib/ruby/vendor_ruby/rails/generators/active_record/model/templates/migration.rb
/usr/lib/ruby/vendor_ruby/rails/generators/active_record/model/templates/model.rb
/usr/lib/ruby/vendor_ruby/rails/generators/active_record/model/templates/module.rb
/usr/lib/ruby/vendor_ruby/rails/generators/active_record/observer/
/usr/lib/ruby/vendor_ruby/rails/generators/active_record/observer/observer_generator.rb
/usr/lib/ruby/vendor_ruby/rails/generators/active_record/observer/templates/
/usr/lib/ruby/vendor_ruby/rails/generators/active_record/observer/templates/observer.rb
/usr/lib/ruby/vendor_ruby/rails/generators/active_record/session_migration/
/usr/lib/ruby/vendor_ruby/rails/generators/active_record/session_migration/session_migration_generator.rb
/usr/lib/ruby/vendor_ruby/rails/generators/active_record/session_migration/templates/
/usr/lib/ruby/vendor_ruby/rails/generators/active_record/session_migration/templates/migration.rb