First, create a new class in your application controller:

class Helper
include Singleton
include ActionView::Helpers::PdfHelper #or whatever helpers you want
end

I wanted to use my pdf_helpers
..and then:

def pdf_helpers
Helper.instance
end
Will create an instance of your new class.

Now, go to your pdf controller (or whatever) and simply:

pdf.text pdf_helpers.my_crazy_helper(@foo.bar)


The pdf.text part is not the important part, thats just for pdf-writer, but what is is using “pdf_helpers.your_helper” to create a new instance of the helper class which will allow you to use that helper.