How to edit or write on existing PDF with Ruby?

Question

I have a couple of PDF template files with complex content and several blank regions/areas in them. I need to be able to write text in those blank regions and save the resul

Answer 1

The best I can think of is Rails-latex, it doesn't allow you to edit existing PDF files but it would allow you to set up template *.tex.erb which you may dynamically modify and compile them into PDF format (along with dvi and a number of others).