8 lines
344 B
Ruby
8 lines
344 B
Ruby
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class Hydrant < ActiveRecord::Base
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belongs_to :user
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def self.find_closest(lat, lng, limit=20)
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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])
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end
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end
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