GeoSearch with Ferret

Hi all,

unfortunately, the site tourb.us has been closed, but the wayback
machine still reveals their approach to geo-searches with ferret [1].
In 2006, Dave (Balman?) replied that things could be handled
differently in later versions. I’m new to Ferret/Ruby/Rails (although
I’ve extensive experiences with Lucene/Java) so I’m wondering if that
actually was implemented, and how such code should look like today. I
couldn’t find an example or tutorial, can anybody please help out?

Kind regards,

Christian

[1]
http://web.archive.org/web/20071223222924rn_1/blog.tourb.us/archives/ferret-and-location-based-searches/