gistfile1.rb

def merge(first_id, second_id)

      first = Article.find(first_id)

      if Article.exists?(second_id)
        second = Article.find(second_id)
      else
        false
      end

      merged_body = first.body + second.body
      final = Article.create(:title => first.title, :author => first.author, :body => merged_body,
                             :user_id => first.user_id, :published => true, :allow_comments => true)

      comments1 = Feedback.find_all_by_article_id(first_id)
      if not comments1.blank?
        comments1.each do |feedback|
          feedback.article_id = final.id
          feedback.save
        end
      end

      comments2 = Feedback.find_all_by_article_id(second_id)
      if not comments2.blank?
        comments2.each do |feedback|
          feedback.article_id = final.id
          feedback.save
        end
      end

      Article.destroy(first_id)
      Article.destroy(second_id)
      final
end