Rails - Aug 2006 - Problems with ActionMailer and multipart emails

This is what I''m trying to do in my actionmailer class:
...
part "text/plain" do |p|
  p.body              = render_message("request.text.plain", 
:email_request => email_request)
  p.transfer_encoding = "base64"
end

if email_request.asset
 attachment "#{email_request.content_type}" do |a|
   a.body     = File.read(email_request.asset)
   a.filename = email_request.filename
  end
end
...

If I remove the part "text/plain"... the email is sent with the 
attachment and no body, (i was hoping that the body would be sent since 
mailer is supposed to implicitly figure it out based on the name: 
request.text.plain).

When I try to send an email as it is above, I get Internal 500 Server 
Errors and 3 lines like this in my lighttpd.errro.log file:

2006-08-23 13:02:52: (mod_fastcgi.c.2430) unexpected end-of-file 
(perhaps the fastcgi process died): pid: 5298 socket: 
unix:/tmp/ruby-fastcgi.juR52.socket-1

2006-08-23 13:02:52: (mod_fastcgi.c.3168) child exited, pid: 5298 
status: 1

2006-08-23 13:02:52: (mod_fastcgi.c.3215) response not received, request 
sent: 218773 on socket: unix:/tmp/ruby-fastcgi.juR52.socket-1 for 
/dispatch.fcgi , closing connection

Any ideas on the problem or ways to debug?


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*UDPATE*

This ended up working for me:

class ApplicationMailer < ActionMailer::Base

  def request(email_request)
    ...
    body       :email_request => email_request

    if email_request.asset
      attachment email_request.content_type do |a|
        a.body     = File.read(email_request.asset)
        a.filename = email_request.filename
      end
    end
  end
end

I still don''t know why I wasn''t able to use the part() method


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