Playing with Excel Files in Ruby Using Roo and Write_XLSX

Because of a small tool pitch I gave to our technical writer, I had a chance to play with Excel files through code for several hours last week. I have not done that before, but I felt that it was a pretty easy enough challenge as I have worked with CSV files in the past and thought that the experience would be something similar. I knew I just have to find out what existing libraries I could take advantage in order to build what I thought the program should be capable of doing, which is basically reading two Excel files, comparing them, and creating a new file with updated data based on both files.

Some googling brought me to the ruby gems Roo and Write_XLSX.

Roo helped with reading Excel files, and we can do this by:

xlsx =
xlsx =
spreadsheet = xlsx.sheet(SHEET_NUMBER)

Once we have access to a desired Excel file, we can get whatever data we need from it:

spreadsheet.each(column_data_1: COLUMN_NAME_1) do |info|
    // do something with information

After that, it’s just a matter of what information do we want to retrieve and manipulate from desired files. I mostly like to use arrays and hashes from here on.

As for creating new Excel files, we can use write_xlsx:

workbook =
worksheet = workbook.add_worksheet

These two libraries can actually do more. Roo has an interesting read/write access with Google spreadsheets using roo-google. Write_XLSX on the other hand have formatting features we can leverage for better looking Excel outputs. I didn’t have to use those functionalies for the current test project though so I’ll leave those for another time.


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