gistfile1.ru

require 'date'

class Article < Hash
  def initialize(hsh={})
    replace(hsh)
  end
  
  def ==(other)
    if other.is_a?(Date)
      self[:date] == other
    else
      super
    end
  end
end

articles = [
  Article.new(:date => Date.new(2008)),
  Article.new(:date => Date.new(2009)),
  Article.new(:date => Date.new(2010))
  ]
  

p articles.index Date.new(2009)