object cache problem

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Hi,

Yesterday I noticed that one of my applications had trouble with the  
object cache.  After chasing the circular reference for a while in my  
code I found out that it seems to be made by Class::DBI.  Or not, in  
which case I'd like to have pointed out what I'm doing wrong. :)

My classes are essentially this:

package Music::Artist;
use base qw(Music::DBI);
__PACKAGE__->table('artists');
__PACKAGE__->columns(Essential => qw/id name primary_cd/);
__PACKAGE__->has_a(primary_cd => 'Music::CD');
__PACKAGE__->has_many(cds => 'Music::CD');


package Music::CD;
use base qw(Music::DBI);
__PACKAGE__->table('cds');
__PACKAGE__->columns(Essential => qw/id title artist /);
__PACKAGE__->has_a(artist => 'Music::Artist');

using $artist->primary_cd->title causes the problem.

I put up an example and test case on http://tmp.askask.com/2005/05/ 
class_dbi.pl.  After the $artist = undef; line I expected the object  
cache to be empty (?)



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