I have four files, two in a subdirectory:

00.t: 

use strict;
use warnings;
use lib '.';
use Test::More;

use_ok 'Service', 'Service.pl loads';
my $xml = Service->new('xml', 'xmldata');
use Data::Dumper; print Dumper $xml;
$xml->populate;
is $xml->{template}, '<data>xmldata</data>', 'XML OK';
my $json = Service->new('json', 'jsondata');
$json->populate;
is $json->{template}, '{"data": jsondata}', 'JSON OK';

done_testing;

[download]

Service.pm 

package Service;
use strict;
use warnings;
use Module::Find;

sub new {
     my $class = shift;
     my $self = bless {
          data     => undef,
          service  => undef,
     }, $class;
     $self->{data} = shift;
     my $service = $self->{data};
     my @found = useall 'Service';
     for my $plugin (@found) {
        if ($plugin =~ /::\Q$service\E$/i) {
            $self->{service} = $plugin;
        }
        last if defined $self->{service};
     }
     return $self;
}

sub populate {
     my $self = shift;
     $self->{template} =~ s/[data]/$self->{data}/msi;
     # $self->{service}->{template} =~ s/[data]/$self->{data}/msi;
}

1;

[download]

Service/XML.pm 

package Service::XML;
use strict;
use warnings;
use parent 'Service';

sub new {
     my $class = shift;
     my $self = bless {
          template => '<data>[data]</data>',
     }, $class;
     return $self;
}

1;

[download]

and Service/JSON.pm 

package Service::JSON;
use strict;
use warnings;
use parent 'Service';

sub new {
     my $class = shift;
     my $self = bless {
          template => '{"data": [data]}',
     }, $class;
     return $self;
}

1;

[download]

The plan is for several, possibly dozens, of subclass files, with the subclass name passed to Service.pl as a parameter. But I cannot find any docs on how to make inheritance work in this case. The tests are returning warnings about uninitialised values in substitution and Data::Dumper shows that the objects have not inherited the 'template' property.

What am I doing wrong, please, and what docs should I have read?

Regards,

John Davies

In reply to [Solved] Inheritance when subclass passed as a parameter by davies

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