generating a two-dimensional code using ruby rqrcode

Reference:   https://github.com/whomwah/rqrcode

1.  gem 'rqrcode'

2. helper in: 

 require 'base64'
  def generate_qr_code string
    qr_code = RQRCode::QRCode.new string
    png = qr_code.as_png(
      resize_gte_to: false, resize_exactly_to: false, fill: 'white', color: 'black', size: 180, border_modules: 0, module_px_size: 0, file: nil # path to write ).to_s Base64.encode64 png return "data:image/png;base64,#{Base64.encode64(png)}" end 

3, views the page

<%= image_tag generate_qr_code('http://baidu.com')%>