Here is a simple example of what I am attempting. I start with with MyClassA which will contain an instance of MyClassB:

package MyClassA;

use strict;
use warnings 'all';

sub new {
    my $classname = shift;
    my $self = {};
    bless($self, $classname);
    my %extras = @_;
    @$self{keys %extras} = values %extras;
    return $self;
}

sub TO_JSON {
    my $self = shift;
    return { %{$self} };
}

sub setClassB {
    my $self = shift;
    $self->{MY_CLASS_B} = shift;
}

sub getClassB {
    my $self = shift;
    return $self->{MY_CLASS_B};
}

1;
[download]

and ,

package MyClassB;

use strict;
use warnings 'all';

sub new {
    my $classname = shift;
    my $self = {};
    bless($self, $classname);
    my %extras = @_;
    @$self{keys %extras} = values %extras;
    return $self;
}

sub TO_JSON {
    my $self = shift;
    return { %{$self} };
}

sub getName {
    my $self = shift;
    return $self->{NAME};
}

1;
[download]

Next, we build and encode MyClassA:

use strict;
use warnings 'all';

use JSON::MaybeXS ':all';
use MyClassA;
use MyClassB;

my $a = MyClassA->new(NAME => 'A instance');
my $b = MyClassB->new(NAME => 'B instance');

$a->setClassB($b);

print JSON->new()->convert_blessed()->encode($a) . "\n";
[download]

And we get output that looks good:

{"NAME":"A instance","MY_CLASS_B":{"NAME":"B instance"}}

The trouble is seen when we try to read and use this JSON:

use strict;
use warnings 'all';

use JSON::MaybeXS ':all';
use MyClassA;
use MyClassB;

my $line = <STDIN>;

my $a = bless(JSON->new()->decode($line), 'MyClassA');

print $a->getClassB()->getName() . "\n";
[download]

Which yields the following error:

Can't call method "getName" on unblessed reference at test_read.pl line 12, <STDIN> line 1.

I suppose I could bless(JSON->new()->decode($a->getClassB()), 'MyClassB'), but is that really the proper way to deal with this situation? Isn't there some way to bless a decoded MyClassA and get something that is blessed deeply? Thanks for your help!

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