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    ...
    <th width="15%"><a href="javascript:sort('location')">Location</a>
+</th>
    <th width="10%"><a href="javascript:sort('astrotype.name')">Type</
+a></th>
    <th width="10%"><a href="javascript:sort('terrain.name')">Terrain<
+/a></th>
    ...

    <script language="JavaScript" type="text/javascript">
    <!--
...
        }
    //-->
    </script>

    sub _sort_column {
        my $key = shift;
...
        }
        return $array_ref;
    }

    my $sort_key = $query->param('sortCol')   || 
                   $session->param('sortCol') || 
...
            order_by      => _sort_column($sort_key),
        } ,
    );

    [% FOREACH base IN bases %]
        [% IF base.astro %]
...
            </tr>
        [% END %]
    [% END %]

package My::Namespace::DB::Bases;

...
);

1;

package My::Namespace::DB::Astros;

...
);

1;

package My::Namespace::DB::AstroTypes;

...
);

1;

package My::Namespace::DB::AstroTerrains;

...

1;