class BaseController < InheritedResources::Base
  before_filter :authenticate_user!, :check_browser
  # inherit_resources

  def check_browser
    if browser.ie6? || browser.ie7?
      redirect_to browser_not_supported_url
    end
  end
end

class BaseController < InheritedResources::Base
  before_filter :authenticate_user!
  # inherit_resources
end

--- 
+++ 
@@ -1,4 +1,10 @@
 class BaseController < InheritedResources::Base
-  before_filter :authenticate_user!
+  before_filter :authenticate_user!, :check_browser
   # inherit_resources
+
+  def check_browser
+    if browser.ie6? || browser.ie7?
+      redirect_to browser_not_supported_url
+    end
+  end
 end
Update base controller to check for outdated browser.
