sub _getBuilderList {
  my $self = shift;

  my $sth = $self->param('DBH')->prepare("SELECT id, city_name FROM city
ORDER BY city_name" );
  $sth->execute();

  # returns a reference to an array of hash refs
  my $cities= $sth->fetchall_arrayref( {} );
  $sth->finish;

  return $cities;
}