config/initializers/composite_primary_keys.rb

   1 # Monkey patch id_was into CPK pending upstream integration
   2 # https://github.com/composite-primary-keys/composite_primary_keys/pull/236
   3 module ActiveRecord
   4   class Base
   5     module CompositeInstanceMethods
   6       def id_was
   7         attribute_was("id")
   8       end
   9     end
  10   end
  11 end