RailsCasts Pro episodes are now free!

Learn more or hide this

Ryan Johnson's Profile

GitHub User: CITguy

Comments by Ryan Johnson


Excel XML is known as SpreadsheetML


  • SpreadsheetML file sizes will be about 3-4 times larger than native XLS files. Not really a problem for small files, but with large data sets this could eat up your system resources to generate the file.
  • SpreadsheetML will only be readable by Microsoft Office. Other mainstream office suites will open it as an XML document.

The CSV approach fits my needs 9 times out of 10. However if you require a native Excel format, please use a gem and avoid using the SpreadsheetML method.