discourse/app/jobs/onceoff/fix_featured_link_for_topics.rb

module Jobs
  class FixFeaturedLinkForTopics < Jobs::Onceoff
    def execute_onceoff(args)
      Topic.where("featured_link IS NOT NULL").find_each do |topic|
        featured_link = topic.featured_link

        begin
          URI.parse(featured_link)
        rescue URI::Error
          topic.update_attributes(featured_link: URI.extract(featured_link).first)
        end
      end
    end
  end
end