# File lib/hammer_cli_csv/content_hosts.rb, line 210
      def import
        @existing = {}
        @host_guests = {}

        thread_import do |line|
          create_systems_from_csv(line)
        end

        print 'Updating host and guest associations...' if option_verbose?
        @host_guests.each do |host_id, guest_ids|
          @api.resource(:systems)\
            .call(:update, {
                    'id' => host_id,
                    'guest_ids' => guest_ids
                  })
        end
        puts 'done' if option_verbose?
      end