def self.get_article(key)
    Article.find :conditions => ["key = ?", key], :joins => :article_versions
  end

  class << self
    def get_article(key)
      find :conditions => {:key => key}, :joins => :article_versions
    end
  end

  named_scope :get_article, lambda {|key| find :conditions => {:key => key}, :joins => :article_versions }