loop

devices.group_by(&:imei).each do |imei, device|
      bar = Bar3d.new
      #bar.set_key(imei, 3)
      #bar.set_key("32412", 3)	
      #bar.colour = colours[bars.size]
      bar.values = device.map(&:deviceid)
      #bar.values = [10, 11];
      bars << bar
    end