I need to generate Excel documents with Ruby (from Rails) on a Linux machine. I know of Spreadsheet::Excel, but it doesn't support formulas, and uses a pretty old format.
Is there any other option, not necessarily free or open source, that is a bit more powerful?
I have come across the gem simple_xlsx_writer.
You can see the example of how to use it over here.
Hope it helps.
How about opening a spreadsheet (Spreadsheet::Excel) with the formulae already populated. Entering data into the referenced cells will cause them to display the result.
How about https://github.com/randym/axlsx
This gem can easily generate spreadsheets in the OOXML format (Open Office XML)