I am getting following warning while generating model, how to get rid of
this warning and what is cause for this warning. I am using rails 3.2.8
SECURITY WARNING: No secret option provided to Rack::Session::Cookie.
This poses a security threat. It is strongly recommended that you
provide a secret to prevent exploits that may be possible from
cookies. This will not be supported in future versions of Rack, and
future versions will even invalidate your existing user cookies.