This morning, after 10 minutes struggle of do or do not follow the self study section. Just spend several hours of searching, coding and debugging, finally I got the following ruby script that is able to pass the self study excise. diff -r 9efeca9bd507 learning/ruby/acts_as_csv_module.rb --- a/learning/ruby/acts_as_csv_module.rb Tue Feb 07 15:13:11 2017 +0800 +++ b/learning/ruby/acts_as_csv_module.rb Tue Feb 07 15:13:49 2017 +0800 @@ -1,32 +1,90 @@ module ActsAsCsv + def self.included(base) base.extend ClassMethods end + module ClassMethods + def acts_as_csv include InstanceMethods end + + def acts_as_enumerable + include Enumerable + end end + module InstanceMethods + def read @csv_contents = [] filename = self.class.to_s.downcase + '.txt' file = File.new(filename) - @headers = file.gets.chomp.split(', ' ) + CsvRow.headers = file.gets.chomp.spl...