In my User model I have:

acts_as_authentic do |c|
  c.perishable_token_valid_for = 30.minutes
end

In my Application Controller I have the standard boilerplate code:

def current_user_session
  return @current_user_session if defined?(@current_user_session)
  @current_user_session = UserSession.find
end

def current_user
  return @current_user if defined?(@current_user)
  @current_user = current_user_session && current_user_session.record
end

Now in my view I need to see if a user is logged in:

<% if current_user %>
  Sign Out
<% else %>
  Sign In
<% end %>

On every single request, current_user is being called, and that causes a SELECT call to be made to the database to find the user, then an UPDATE call that updates the last_request_at and perishable_token even though I set perishable_token_valid_for = 30.minutes.

1. Does anyone have a better way to see if a user is logged in without causing a SELECT and UPDATE on every single page of my app.

2. Does anyone know why the perishable token keeps updating even if I set it to be valid for 30 minutes???