barcorde generation from out of the controller

[Oscar]

I'm able to generate code39 barcode within from controller with the code:

pdf = Prawn::Document.new

        barcode = Barby::Code39.new @order.order_number

        barcode.annotate_pdf(pdf, :height => 30)

        pdf.text @order.order_number

        send_data pdf.render

Now, I changed controller so it will invoke ruby code:

format.pdf do

        pdf = InvoicePdf.new(@order, view_context)

        send_data pdf.render, filename: "invoice_#{@order.order_number}.pdf",

                              type: "application/pdf",

                              disposition: "inline",

                              size: 10

      end

So, my invoice_pdf.rb:

require 'barby'

require 'barby/barcode/code_39'

require 'barby/outputter/prawn_outputter'

class InvoicePdf < Prawn::Document

def initialize(order, view)

super({

:top_margin => 70,

:page_size => 'A4',

:font_size => 10,

:text  => 8

})

barcode_gen

end

def barcode_gen

barcode = Barby::Code39.new @order.order_number

barcode.annotate_pdf(XXXX, :height => 30)

end

end

How should I change the XXXX in this case?

[Oscar]

http://stackoverflow.com/q/17915334/1745902