Type::Tiny has as one of its aims to make it easy to add coercions to individual attributes really easy. Here's an example:
use strict;
use warnings;
{
package Local::Test;
use Moose;
use Types::Standard qw( Str Undef );
my $_id_default = sub { "id" . int(rand(1000)+1) };
has id => (
is => 'rw',
isa => Str->plus_coercions(Undef, $_id_default),
default => $_id_default,
coerce => 1,
);
__PACKAGE__->meta->make_immutable;
}
print Local::Test->new(id => 'xyz123')->dump;
print Local::Test->new(id => undef)->dump;
print Local::Test->new->dump;
You could also look at MooseX::UndefTolerant which makes undef
values passed to the constructor act as if they were entirely omitted. This won't cover passing undef to accessors though; just constructors.