mongoid/mongoid — pull request #2386 by bradrees (2012-09-18 10:26:32+00:00)
Title: Geo haystack and 'bits' parameters for 2d indexes

This adds support for the geoHaystack type of index to be created. It also enables the bits parameter to be added to a 2d index.

http://www.mongodb.org/display/DOCS/Geospatial+Haystack+Indexing
http://www.mongodb.org/display/DOCS/Geospatial+Indexing