Render QR Codes easily from your Rails 3 controllers. This gem can return SVG and PNG files.

Installation

Add the gem to your Gemfile

gem "rqrcode-rails3"

If you want to use the PNG format, you will have to have ImageMagick installed on your system. You will also want to add the “mini_magick” gem to your Gemfile

gem "mini_magick"

How to use

In your controller actions, you can return a QRCode that links to the current page like this:

respond_to do |format|
  format.html
  format.svg { render :qrcode => request.url }
  format.png { render :qrcode => request.url }
end

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This project rocks and uses MIT-LICENSE.