__PACKAGE__->set_primary_key('artistid');
__PACKAGE__->add_unique_constraint(['name']);
__PACKAGE__->add_unique_constraint(artist => ['artistid']); # do not remove, part of a test
+__PACKAGE__->add_unique_constraint(u_nullable => [qw/charfield rank/]);
__PACKAGE__->mk_classdata('field_name_for', {