GeoRSS aggregator and Layar augmented reality server
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  1. class Post < ActiveRecord::Base
  2. belongs_to :feed
  3. EARTH_RADIUS_M = 6378000
  4. def self.near(lat, lng, radius_m)
  5. all(
  6. :loc => {
  7. '$nearSphere' => [ lng, lat ],
  8. '$maxDistance' => radius_m / EARTH_RADIUS_M
  9. })
  10. end
  11. end