[Create a zip file]

create_zip_file.rb

# Zip file
#
# @private
#
# @return [String] path to file
def zip_file
  zfilename ||= 'example.zip'
  zfile ||= Tempfile.new(zfilename) # you can also create a non-temp file so that it's not in the tmp directory
  Zip::File.open(zfile.path, Zip::File::CREATE) do |zip|
    ['path/to/file1', 'path/to/file2'].each do |filepath|
      next unless File.exist?(filepath)

      zip.add(File.basename(filepath), filepath)
    end
  end
  zip_file.close # this will close the file but won't delete it; use .close! to delete
  zip_file.path
end

# Zip file data
#
# @private
#
# @return [String]
def zip_data
  @zip_data ||= File.read(zip_file.path)
end