prawn-for-mike

Gemfile

# in your Gemfile

gem 'prawn'
gem 'prawn-table'


# then run bundle install

order_pdf.rb

# in app/pdfs/order_pdf.rb

require 'prawn/measurement_extensions'

class OrderPDF < Prawn::Document
  attr_reader :order

  def initialize(order)
    @order = order

    super(
      skip_page_creation: true,
      page_size:          [8.5.in, 11.in],
      layout:             :portrait,
      top_margin:         0.5.in,
      bottom_margin:      0.5.in,
      left_margin:        0.5.in,
      right_margin:       0.5.in,
    )
  end

  def generate(render_to = nil)
    start_new_page

    # prawn code goes here

    text "Order \##{order.id}", style: :bold, size: 12
    move_down 2

    text 'Some other text', style: :bold, size: 12
  end
end

orders_controller.rb

# in your controller

class OrdersController < ApplicationController
  # ... other action methods

  def show
    @order = Order.find(params[:id])

    respond_to do |format|
      format.html
      format.pdf do
        pdf = OrderPDF.new(@order)
        send_data pdf.generate, filename: 'order.pdf', type: 'application/pdf', disposition: 'attachment'
      end
    end
  end
  
  # ... other action methods
end