zip_file.rb

def sort_files(file_params, ar_object) # Active Record Object
     if file_params.values.count >= 2 # <- If there are more than two files being submitted.
       tmp_filename = "#{Rails.root}/tmp/" << Time.now.strftime('%Y-%m-%d-%H%M%S-%N').to_s << ".zip" # <- Unique file name
       file_count = 0
       Zip::File.open(tmp_filename, Zip::File::CREATE) do |zipfile| # <- Find or create a file with this name
         file_params.values.each do |file| # <- Loop over all the files in the array.
           new_filename = "#{file_count += 1}-#{file.original_filename}"
           puts new_filename
           zipfile.add(new_filename, file.path) # <- Add file to zip.
         end
         zipfile.close # <- Close the zip stream.
       end
       zipped_file = File.open(tmp_filename) # <- Hold a reference to the zipfile.
       ar_object.csv_file = zipped_file
       File.delete(zipped_file.path) if File.exist?(zipped_file.path) # <- Cleanup tmp folder.
       puts "#{ar_object.inspect}"
     else
       file = file_params.values.first
       ar_object.csv_file = file
       puts "#{ar_object.inspect}"
     end
   end