lib/sfkb/knowledge.rb
def articles
      Enumerator.new do |y|
        article_ids.each do |id|
          y << article(id)
        end
      end
    end
def articles
      Enumerator.new do |y|
        article_ids.each do |id|
          y << article(id)
        end
      end
    end
Enumerates articles