-my %ladders = (
- map { $_->{ladder}->[0]->{ladderId} => $_ } # unique
- grep { $_->{ladder}->[0]->{division} }
- map { $_->{previousSeason}->@*, $_->{currentSeason}->@* }
- @ladderdata
-);
+
+# merge relevant ladder data of all users
+my %ladders;
+for my $season (qw[ currentSeason previousSeason ]) {
+ for my $row (map { $_->{$season}->@* } @ladderdata) {
+ $row->{ladder}->[0]->{division} or next;
+ $row->{season} = $season;
+ $ladders{ $row->{ladder}->[0]->{ladderId} } //= $row;
+ }
+}
+