hello monks

I've just started using Class::DBI and I can't quite get the hang of setting up relationships. I think I'm probably missing something obvious here, but I can't figure out what's going on. Any help would be appreciated!

I have a class Sessions_Metadata which contains foreign keys to classes Users and Sessions (see below). I have a test script which creates an instance of Sessions_Metadata and attempts the following tests: [1] isa_ok($sessions_metadata->username,"EP::Common::DBI::Users");[2] isa_ok($sessions_metadata->session_id,"EP::Common::DBI::Sessions"); If I only run test 2, it works fine and I get:
ok 1 - The object isa EP::Common::DBI::Sessions
If I run both tests, or I run only test 1 I get an error:
Can't bind a reference (EP::Common::DBI::Sessions=HASH(0x85d1d70)) at /usr/local/lib/perl5/site_perl/5.8.1/DBIx/ContextualFetch.pm line 51,<FILE> line 47.

So, I thought the problem was with test 1 and the Users class (even though the error refers to Sessions), but if I comment out the has_a(session_id=>'EP::Common::DBI::Sessions') line in the Sessions_Metadata class, and run test 1 I get:
ok 1 - The object isa EP::Common::DBI::Users

So, if I have both has_a definitions, the Sessions class works, but the Users class doesn't. If I only have the has_a defined for Users then the Users class works.

Can anyone see what I've done wrong?

Many thanks

Cxx

Class Definitions... 

###### Users ####### 
package EP::Common::DBI::Users; 
use strict; 
use warnings; 
use base qw( EP::Common::DBI ); 
__PACKAGE__->table('users');
__PACKAGE__->columns(Primary => qw/username/); 
__PACKAGE__->columns(All => qw/password salt session_only first_name 
last_name institute department address telephone email/);


###### Sessions ########
package EP::Common::DBI::Sessions;
use strict;
use warnings;
use base qw( EP::Common::DBI );
__PACKAGE__->table('sessions');
__PACKAGE__->columns(Primary => qw/id/);
__PACKAGE__->columns(All => qw/a_session/);


######### Sessions_Metadata #################
package EP::Common::DBI::Sessions_Metadata;
use strict;
use warnings;
use base qw( EP::Common::DBI );
#setup table fields
__PACKAGE__->table('sessions_metadata');
__PACKAGE__->columns(Primary => qw/session_id/);
__PACKAGE__->columns(Others => qw/create_date username expire query_id
+/);
#relations
__PACKAGE__->has_a(username=>'EP::Common::DBI::Users');
__PACKAGE__->has_a(session_id=>'EP::Common::DBI::Sessions');

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In reply to Class::DBI has_a relationships by CassJ

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