memcached session storage not work for activerecord object ?

rubyonrails-talk
1

I use memcached to store session. It works great if store string in session, but not work if I store activerecord object.

for example,

[view1] <% session[:k] = "test" %> <% session[:o] = User.find(1) %>

[view2] <%= session[:k] %> # test <%= session[:o] %> # nil

I expect session[:o] will be object query from User.find(1), but it's nil. any idea ?