Mobile.rb

def mobile_device
    # user_agent = 'Mozilla/5.0 (Windows NT 6.2; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/30.0.1599.17 Safari/537.36'
    user_agent = request.env['HTTP_USER_AGENT']
    client = DeviceDetector.new(user_agent)

    client.name # => 'Chrome'
    client.full_version # => '30.0.1599.69'

    client.os_name # => 'Windows'
    client.os_full_version # => '8'

    # For many devices, you can also query the device name (usually the model name)
    client.device_name # => 'iPhone 5'
    # Device types can be one of the following: desktop, smartphone, tablet, console, 
    # portable media player, tv, car browser, camera
    return client.device_type # => 'smartphone'
  end