passing a named_scope through a named_route

I know i can pass a hash to a named_route, but how do i filter.

example

i have a bookings_controller and i want to filter the index lists
based on which link is clicked.

so something like
<%= link_to "Current Bookings", bookings_path(@current_bookings) %>

@current_bookings is set to Booking.current_bookings

and i have a named_scope
named_scope :current_bookings, :conditions => ['departure_date <= ?',
Date.today]

and i want to do something similar with archived_bookings and
canceled_bookings all using the same index view, but the data is
filtered based on the link that has been clicked

is this possible, and if so how?