example.pl

  my ($time, $ticket_ids) = await Mojo::Promise->all(
    $redis->get_p("department:$id:tickets:refresh"),
    $redis->smembers_p("department:$id:tickets"),
  );
  return [] unless @{ $ticket_ids->[0] };

  my @tickets = await Mojo::Promise->all(map { $self->get($_) } @{ $ticket_ids->[0] });
  return (
    [map { $_->[0] } @tickets],
    $time->[0],
  );