That's because you're mapping the has_many items to call the block_id accessor of the related objects. In other words, you're getting yourself back.

Change

__PACKAGE__->has_many('adslot' => ['admt::cdbi::adslot', 'blockid']);
[download]

to

__PACKAGE__->has_many('adslot' => 'admt::cdbi::adslot');
[download]

and try again :)

See http://search.cpan.org/~tmtm/Class-DBI-v3.0.14/lib/Class/DBI.pm#Mapping for the details.