module Devise::Models::Timeoutable

def self.required_fields(klass) 

def self.required_fields(klass)
  []
end

def timedout?(last_access)

Checks whether the user session has expired based on configured time. 
def timedout?(last_access)
  !timeout_in.nil? && last_access && last_access <= timeout_in.ago
end

def timeout_in 

def timeout_in
  self.class.timeout_in
end