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Here are the steps to create a GS1-128 barcode using Ruby on Rails:

1. Install the barby and barby-ean-ucc gems in your Rails application.

   gem install barby
   gem install barby-ean-ucc
   

2. Create a new barcode object using the Barby::EAN128 class.

   barcode = Barby::EAN128.new('01012345678901234567890')
   

3. Render the barcode using a renderer. In this example, we'll use the Barby::PngOutputter to output the barcode as a PNG image.

   png_data = Barby::PngOutputter.new(barcode).to_png
   

4. Optionally, you can save the barcode image to a file.

   File.open('barcode.png', 'wb') { |f| f.write png_data }
   

That's it! You now have a GS1-128 barcode generated in Ruby on Rails.