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Following up on our recent release of GeoKit, Bill and I are working on some posts highlighting some of GeoKit's cool features. This post is on distance calculations. GeoKit can calculate distance in memory, and it can calculate distance as part of a database query. In-memory distance calculation The basic syntax for in-memory distance calculations is: d = first_loc.distance_to(second_loc) What cl

The CRUD methodology in Rails 1.2 is a great way to simplify your application structure. One of the first things you will find yourself doing is nesting one resource inside another. This is just the RESTful way of working with has_many relationships. The first couple times I did this, I forgot some of the steps (particularly changing the url paths in the controllers). So, I'm going to iterate the

Update April '07: GeoKit, my Rails Geocoding plugin, abstracts away all the geocoding logic for multiple providers (Google, Yahoo Geocoder.us, Geocoder.ca -- including failover!), distance-based finders for ActiveRecord, and much more! This is a simple example to demonstrate how to display a Google Map using Ruby on Rails, including utilizing a geocoding web service to translate addresses to geoco

GZoom is a custom Google Maps control which allows you to zoom by dragging a rectangle on the map. Read on for an example. Update #1: I've posted the uncompressed source code here: gzoom_uncompressed.js . The code is released under an MIT-style license. Enjoy, and let me know if you make enhancements to the code that others might find useful -- I'll try to roll useful enhancements back into the co