Example: Transactional Data Import

import.rb

class Import  

    def import_workouts(rows)
        errors = []
  
        CSV.foreach(@import_file_path, {headers: true}) do |row|
            begin
                attributes = row.to_hash
                row.create(attributes)
                errors += row.failures
            rescue StandardError => e
                errors << [row.index, row.data, [e.message, *e.backtrace]]
            end
        end
    
        File.open('import_error_report', 'w') { |file| file.write(errors.join("\n") }
    end
    
    ...
end