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    [Component]
    public class CSVList : List<string>
    {
// ReSharper disable UnusedPrivateMember
        private string Value
// ReSharper restore UnusedPrivateMember
        {
            get { return string.Join(",", this.ToArray()); }
            set
            {

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Server Error in '/' Application.
Value cannot be null.
Parameter name: row
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.ArgumentNullException: Value cannot be null.
Parameter name: row

Source Error:

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var conf = new MapConfiguration();
conf.DefaultStore = new DatabaseStore(conf, Settings.Database);
conf.Initialize();
DataContext = new DataContext(conf);

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Keywords = Request.Form["Keywords"]
    .Replace("\r\n", ",")
    .Split(',')
    .Where(k => k.Length > 0)
    .Select(k => k.Trim()).ToList()

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def self.find_by_probability(user)
  links = Link.find :all, :include => :votes
  users = User.select { |u| u.votes.id }.to_a

  links.map do |link|
    link.probability = bayes(
      link,
      users_with_link(link, users),
      proc{|e, h| common_links(e, user, h) / all_links(e, user, h) },
      proc{|e| e.votes.size.to_f / links.size },

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Notes

The original subs actually making a query with printing the query, so no real queries here either.

The 'transaction' from the original doesn't appear to do anything except close over the connection argument. I didn't implement any transactional functionality because the original didn't appear to have any.

It doesn't make sense to memoize the non-query stuff and always run the query which is going to be your slowest thing. It also doesn't make sense to memoize inserts which always need to run.

Output

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class RenameThingsToRecords < ActiveRecord::Migration
  def self.up
    command = OrderedHash.new
    command['renameCollection'] = "#{MongoMapper.database.name}.things"
    command['to'] = "#{MongoMapper.database.name}.records"
    MongoMapper.connection.db('admin').command(command)
  end

  def self.down
    command = OrderedHash.new

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>> hash = {:blah.lte => 5}
=> {#<MongoMapper::FinderOperator:0x105113338 @field=:blah, @operator="$lte">=>5}
>> hash[:blah.lte]
=> nil
>> :blah.lte == :blah.lte
=> false

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class Test
include Enumerable

  def initialize(arr)
    @arr = arr
  end

  def each(&block)
    @arr.each do |el|
      puts "start #{el}"

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def integer?
  ActivePattern::Pattern.build do |value, pass|
    if value.is_a? Integer
      value
    elsif value.is_a? String
      /\A[-+]?\d+\z/ === value ? value.to_i : pass
    else
      pass
    end
  end