gistfile1.rb

xdef distance(a, b)
  return a.length if (0 == b.length)
  return b.length if (0 == a.length)

  unpack_rule = ($KCODE =~ /^U/i) ? 'U*' : 'C*'

  mapper = lambda{|str|
    str = str.unpack(unpack_rule)
    map = []
    str.each_with_index {|letter,idx|
      occurrence_count = 0
      str[0,idx+1].each { |curr_val| occurrence_count += 1 if curr_val == letter }

      map.push("#{letter}-#{occurrence_count}")
    }
    map
  }

  map1 = mapper.call a
  map2 = mapper.call b

  diff_map = (map2.length > map1.length) ?
    map2 - map1 : map1 - map2

  return diff_map.length
end

ChromeToCategory.all.each do |ctc|
  unless ctc.category_id.blank?
    oc = Category.find(ctc.category_id)
    nc = Category.find_by_old_id(ctc.category_id)
    begin
      unless oc.ancestors.first.name.downcase == "autos" && distance(oc.ancestors.second.name.downcase, ctc.vehicle_name.split('>').first.strip.downcase) <= 1
        if nc.ancestors.first.name.downcase == "autos" && distance(nc.ancestors.second.name.downcase, ctc.vehicle_name.split('>').first.strip.downcase) <= 1
          ctc.category_id = nc.id
          ctc.save
        else
          puts "Error! with ChromeToCategory id ##{ctc.id}"
        end
      else
        #    puts "Notice! ChromeToCategory id ##{ctc.id} appears to be right."
      end
    rescue NoMethodError
      puts "Error! nil category for ChromeToCategory id ##{ctc.id}"
    end
  end
end