lib/rack-cas/session_store/active_record.rb
def delete_session(req, sid, options)
      Session.where(session_id: sid).delete_all

      options[:drop] ? nil : generate_sid
    end
def delete_session(req, sid, options)
      Session.where(session_id: sid).delete_all

      options[:drop] ? nil : generate_sid
    end
Rack 2.0 method