/usr/lib/ruby/vendor_ruby/active_record/associations/preloader/ 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/active_record/associations/preloader/association.rb
/usr/lib/ruby/vendor_ruby/active_record/associations/preloader/belongs_to.rb
/usr/lib/ruby/vendor_ruby/active_record/associations/preloader/collection_association.rb
/usr/lib/ruby/vendor_ruby/active_record/associations/preloader/has_and_belongs_to_many.rb
/usr/lib/ruby/vendor_ruby/active_record/associations/preloader/has_many.rb
/usr/lib/ruby/vendor_ruby/active_record/associations/preloader/has_many_through.rb
/usr/lib/ruby/vendor_ruby/active_record/associations/preloader/has_one.rb
/usr/lib/ruby/vendor_ruby/active_record/associations/preloader/has_one_through.rb
/usr/lib/ruby/vendor_ruby/active_record/associations/preloader/singular_association.rb
/usr/lib/ruby/vendor_ruby/active_record/associations/preloader/through_association.rb