post.rb

  def make_nofollow_links
    domains = %w(inmyroom kitchenmag)

    if content.present?
      json_content = begin
        JSON.parse content
      rescue
        []
      end

      json_content.each do |plugin|
        if plugin['name'] == 'text_area'
          html_with_links = auto_link(plugin['data'], html: {target: '_blank'})

          html_with_links.scan(/(\<a href=["'].*?["']\>.*?\<\/a\>)/).flatten.each do |link|
            node = Nokogiri::HTML::DocumentFragment.parse(link).children.first
            next if node[:href].match /(#{ domains.join('|') })\.(ru|dev|dev:3000)/
            html_with_links.gsub! link, "<a href='#{ node[:href] }' rel='nofollow' target='#{ node[:target] }'>#{ node.content }</a>"
          end

          plugin['data'] = html_with_links
        end
      end

      json_content.to_json
    end
  end