Rails - 使用邮件程序模板为多部分电子邮件设置多个布局

So Rails 2.2 added mailer layouts, which is great, except that I can't figure out how to make them work when I'm sending a multipart email..it's wrapping my mail content with the same layout for both the text/plain version and the text/html version. What I want is to wrap my layout around either only the text/html version, or to be able to have a separate layout for each.So Rails 2.2 added mailer layouts, which is gre