not_horrible.rb

if @member.years[0]
  year_numbers = @member.years.map { |year|
    year.description.to_i
  }.sort
  first_year = year_numbers.shift
  year_numbers.reduce([[first_year]]) do |year_collection, year|
    if year_collection[-1][1] == year-1 || !year_collection[-1][1]
      (year_collection[-1][1] = year; year_collection)
    else
      (year_collection)+[[year]]
    end
  end.map { |collection| collection.join(' - ') }.join('; ')
else
  'None'
end