Transactions for nested creation of objects in a controller

transaction.rb

Channel.transaction do
  @channel.save

  rss_bot = @channel.build_youtube_rss_bot(:username => youtube_username)

  if rss_bot.valid?
    rss_bot.save
    Delayed::Job.enqueue(SocialFeed::YoutubeRssScraper.new(rss_bot))
  else
    @channel.errors.add(:youtube_username, rss_bot.errors[:username])
    raise ActiveRecord::Rollback
  end
end