What's the easiest way to detect the user's operating system in Rails 3?

Question

Simple Rails app, mostly scaffolding. I want to detect whether the user is using Android or iPhone to access my app. What\'s the easiest way to do that?

Answer 1

  def getBrowser(bt)
    rs=false
    ua=request.env['HTTP_USER_AGENT'].downcase
    isOpera = ua.index('opera') ? true : false
    isSafari = (ua =~ /webkit|khtml/) ? true : false
    isSafari3 = (ua.index('webkit/5') ? true : false
    isGecko = (!isSafari and ua.index('gecko')) ? true : false
    isGecko3 = (!isSafari and ua.index('rv:1.9')) ? true : false
    isIE = (!isOpera and ua.index('msie')) ? true : false
    isIE7 = (!isOpera and ua.index('msie 7')) ? true : false
    case bt
      when 0  #isKonqueror
        if ua.index('konqueror') then rs=true end
      when 1  #isOpera
        rs=isOpera
      when 2  #isSafari
        rs=isSafari
      when 3  #isSafari2
        rs=isSafari && !isSafari3
      when 4  #isSafari3
        rs=isSafari3
      when 5  #isIE
        rs=isIE
      when 6  #isIE6
        rs=isIE && !isIE7
      when 7  #isIE7
        rs=isIE7
      when 8  #isGecko
        rs=isGecko
      when 9  #isGecko2
        rs=isGecko && !isGecko3
      when 10 #isGecko3
        rs=isGecko3
      when 11 #isWindows
        if ua.index('windows') or ua.index('win32') then rs=true end
      when 12 #isMac
        if ua.index('macintosh') or ua.index('mac os x') then rs=true
end
      when 13 #isAir
        if ua.index('adobeair') then rs=true end
      when 14 #isLinux
        if ua.index('linux') then rs=true end
      when 15 #isSecure
        s = request.env['SERVER_PROTOCOL'].downcase
        if s.index('https') then rs=true end
    end
    rs
  end 

http://groups.google.com/group/rubyonrails-talk/browse_thread/thread/8fa57719fd9316e1