Thank you.
Data::Rmap was exactly what I needed. The example script below converts every value corresponding to a key of 'b' to an array unless it already is an array.
use strict;
use warnings;
use Data::Rmap qw(rmap_hash);
use Data::Dumper;
$Data::Dumper::Sortkeys = 1;
$Data::Dumper::Indent = 1;
my $data = {
a => {
b => 1,
x => 3,
},
b => 1,
c => {
d => [
{ b => 3 },
{ b => [5, 6, 7] },
{ x => 3},
],
},
};
my $key = 'b';
my @to_fix = rmap_hash {
exists($_->{$key}) && (ref($_->{$key}) ne "ARRAY")
? $_ : ()
} $data;
for my $h(@to_fix) {
$h->{$key} = [ $h->{$key} ];
}
warn Dumper($data);
Output:
$VAR1 = {
'a' => {
'b' => [
1
],
'x' => 3
},
'b' => [
1
],
'c' => {
'd' => [
{
'b' => [
3
]
},
{
'b' => [
5,
6,
7
]
},
{
'x' => 3
}
]
}
};