Don't worry, it's easy. 
sub foreign_obj {
    my $self = shift;
    my $foreign_obj = Foreign::Class->retrieve(
        key1 => $self->key1(),
        key2 => $self->key2(),
    );
    return $foreign_obj;
}

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In reply to Re: Class::DBI has_a() relationships with multi-value keys by perrin
in thread Class::DBI has_a() relationships with multi-value keys by MrCromeDome

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