adopt-a-hydrant/app/models/hydrant.rb

class Hydrant < ActiveRecord::Base
  belongs_to :user

  def self.find_closest(lat, lng, limit=100)
    Hydrant.find_by_sql(["SELECT *, (3959 * ACOS(COS(RADIANS(?)) * COS(RADIANS(lat)) * COS(radians(lng) - RADIANS(?)) + SIN(RADIANS(?)) * SIN(RADIANS(lat)))) AS distance FROM hydrants ORDER BY distance LIMIT ?", lat, lng, lat, limit])
  end
end
Add User and Hydrant classes 2011-02-23 20:50:59 +00:00			`class Hydrant < ActiveRecord::Base`
			`belongs_to :user`

Set default number of hydrants to 100 2011-02-25 21:51:56 +00:00			`def self.find_closest(lat, lng, limit=100)`
Add User and Hydrant classes 2011-02-23 20:50:59 +00:00			`Hydrant.find_by_sql(["SELECT , (3959 ACOS(COS(RADIANS(?)) * COS(RADIANS(lat)) * COS(radians(lng) - RADIANS(?)) + SIN(RADIANS(?)) * SIN(RADIANS(lat)))) AS distance FROM hydrants ORDER BY distance LIMIT ?", lat, lng, lat, limit])`
			`end`
			`end`