Refactored pdf generation with newest prawn.

lib/order_pdf.rb

@@ -0,0 +1,32 @@
+require "prawn/measurement_extensions"
+
+class OrderPdf < Prawn::Document
+  include ActionView::Helpers::NumberHelper
+
+  def initialize(order, options = {})
+    options[:page_size] ||= "A4"
+    #options[:left_margin]   ||= 40
+    #options[:right_margin]  ||= 40
+    options[:top_margin]    ||= 50
+    #options[:bottom_margin] ||= 40
+    super(options)
+    @order = order
+  end
+
+  def to_pdf
+    # Define header
+    repeat :all, dynamic: true do
+      draw_text title, size: 10, style: :bold, at: [bounds.left, bounds.top+20] if title # Header
+      draw_text "Seite #{page_number}", size: 8, at: [bounds.left, bounds.bottom-10] # Footer
+    end
+
+    body  # Add content, which is defined in subclasses
+
+    render  # Render pdf
+  end
+
+  # Helper method to test pdf via rails console: OrderByGroups.new(order).save_tmp
+  def save_tmp
+    File.open("#{Rails.root}/tmp/#{self.class.to_s.underscore}.pdf", 'w') {|f| f.write(to_pdf.force_encoding("UTF-8")) }
+  end
+end