class method self.setup_sessid_compatibility!

# File activerecord/lib/active_record/session_store.rb, line 110
          def setup_sessid_compatibility!
            # Reset column info since it may be stale.
            reset_column_information
            if columns_hash['sessid']
              def self.find_by_session_id(*args)
                find_by_sessid(*args)
              end

              define_method(:session_id)  { sessid }
              define_method(:session_id=) { |session_id| self.sessid = session_id }
            else
              class << self; remove_method :find_by_session_id; end

              def self.find_by_session_id(session_id)
                find :first, :conditions => {:session_id=>session_id}
              end
            end
          end