DetectMobile.groovy

// from: http://adammonsen.com/post/548

detectMobile (controller:'*', action:'*') {
  before = {
    if (request.getHeader('user-agent') =~ /(?i)iphone/) {
      request['isMobile'] = true
    } else {
      request['isMobile'] = false
    }
    return true // keep processing other filters and the action
  }
  after = { }
  afterView = { }
}

def afterInterceptor = { model, modelAndView ->
  if (request['isMobile']) {
    modelAndView.viewName = modelAndView.viewName + "_m"
  }
}