Prawn PDF Export with page break for bounding_box

pdf_export.rb

class PdfExport < Prawn::Document
  def to_pdf
    build_pdf
    render
  end

  def build_pdf
    add_page_break_if_overflow do
      bounding_box([155, cursor - 25], :width => 330) do
        # Put some PDF text here...  
      end
    end
  end
  
  def add_page_break_if_overflow(&block)
    roll = transaction do
      yield(self)

      rollback if bounds.bottom > cursor
    end

    unless roll
      start_new_page
      yield(self)
    end
  end
end