Session Problem


I am creating an application regarding the book in which the user can read the content of the book. I want the user should be automatically redirect to the login page after the interval of 30 seconds while reading the book. For login / logout I’m using Devise. I have created a new controller named “pustak_controller.rb” for the purpose of session. I am totally new to this. I have tried to create the follow login [0] but it gives me an error " undefined method `-’ for nil:NilClass ". Please help and tell me where I am going wrong.

[0] :

If you have not already done so then I suggest starting by working
right through a good tutorial such as (which is free
to use online). That will show you the basics of rails.

Note that for your automatic redirect after 30 seconds I think you
will have to use javascript.