bad_three_nearest_coordinates.rb

class GeoCoordinate
  def initialize(latitude, longitude)
    @latitude = latitude
    @longitude = longitude
  end

  ##
  # returns array

  def nearest_coordinates
    # magic
  end

  ##
  # returns integer

  def nearest_coordinates_count
    # magic
  end
   
  ##
  # may returns false, nil, <GeoCoordinate>, or array :)

  def three_nearest_coordinates
    return false unless @latitude.present? and @longitude.present?

    case nearest_coordinates_count
    when 0
      return nil
    when 1
      nearest_coordinates.limit(1).first
    when 2
      nearest_coordinates.limit(2)
    when 3
      nearest_coordinates.limit(3)
    else
      nearest_coordinates.limit(3)
    end
  end
end