three_nearest_coordinates.rb

class GeoCoordinate
  # some code
  
  ##
  # returns array

  def three_nearest_coordinates
    return [] unless @latitude.present? and @longitude.present?

    coords_count = nearest_coordinates_count
    case coords_count
    when 0
      return []
    when ->(integer) { [1, 2, 3].include?(integer) }
      nearest_coordinates.limit(coords_count)
    else
      nearest_coordinates.limit(3)
    end
  end
end