Multi-column PDF generating with Prawn in ruby

prawn_multi_column.rb

# Not breaking the page but continue on the next column
# Example of 2 columns table with some styling
def render_left_products_list
    column_box([-5, cursor], columns: 2, height: cursor, position: :left, width: bounds.width, spacer: 40) do

      @categories.each do |category|
        move_down 6
        table line_item_rows(category), position: :left, cell_style: { size: 7, text_color: "000000", borders: [:bottom], border_lines: [:dotted], padding: [2, 0, 4, 0] } do
          column(1).style align: :right
          style(row(0), text_color: 'FF0000')
          align                = { 0 => :left, 1 => :right}
          self.width           = 285
          self.header          = true
          column(1).font_style = :bold
          row(0).size          = 8
          row(0).font_style    = :bold
          row(0).borders       = []
        end
      end
    end
  end

  def line_item_rows(category)
    [[category.name, '']] +
    category.products.map do |product|
      [product.name, "#{format('%.2f', product.price)} USD"]
    end
  end