Generate QR code

Gemfile

# frozen_string_literal: true

source "https://rubygems.org"

gem "prawn"
gem "prawn-qrcode"
gem "matrix"

sample_qr.rb

# https://dev.to/botreetechnologies/how-to-generate-qr-codes-using-prawn-qrcode-in-ruby-4c3a
# Ruby 3.1+ version

require "prawn"
require "prawn/measurement_extensions"
require "prawn/qrcode"

def generate_qr_code_and_render_in_pdf
  pdf = Prawn::Document.new(page_size: [40.mm, 25.mm], margin: [10, 10, 10, 10])
  pdf.font_size 8
  array = %w[Iron Joker John Joel Tim Hydra Phenix Nick Pokemon]
  array.each do |row|
    puts "generating QR code for: #{row}"
    qrcode_content = row
    if !qrcode_content.empty?
      qrcode = RQRCode::QRCode.new(row, level: :h, size: 1)
      pdf.move_down(5)
      pdf.render_qr_code(qrcode, dot: 1.2, align: :left)
      pdf.move_up(20)
      pdf.indent(55) do
        pdf.text qrcode_content
      end
      pdf.start_new_page
    end
  end
  pdf.render_file("sample.pdf")
end
generate_qr_code_and_render_in_pdf