file upload problem when using form_remote_tag

Hi
    I have a form like
<%= form_remote_tag :url => { :action => 'attach_file',
                              :id => @sd_ticket.id },
                                    :enctype => 'multipart/form-data' %>

<table cellpadding="4" cellspacing="0" border="0" width="100%"
class="itiltable2">

<tr>
    <td width="25%"><%= text_area "service_desk_attachment1",
"description", "cols" => 50, "rows" => 1 %></td>

    <td width="25%" colspan="4"><%= upload_column_field
'service_desk_attachment1', 'attachment' %></td>

</tr>
<button type="submit" value="save" >Attach File</button>
<%=end_form_tag %>

This is not working (the file not uploaded)
WHAT I GET ON THE CONTROLLER IS AS A RESULT OF

puts params[:service_desk_attachment1][:description]
puts params[:service_desk_attachment1][:attachment] IS

file1
D:\Sijo\file1.txt

BUT THE SAME WAS WORKING WITH THE FOLLOWING .ie JUST WHEN IT WAS
start_form_tag instead of form_remote_tag as

<%= start_form_tag ({:action => 'attach_file', :id => @sd_ticket.id,
:method => 'post'}, :enctype => 'multipart/form-data')%>

THE ABOVE IS WORKING(the file not uploaded), AND I GET IN THE
CONTROLLER
file1
#<StringIO:0x47cee90>

WHY THIS HAPPENS
PLEASE HELP
Sijo

as far as I know, you can't upload files through an AJAX call. Also,
start_form_tag is deprecated, so you shouldn't use that anymore.

Mike

use form_tag

yes, there is way but you have to use the "iframe remoting pattern" to
do that

This great tutorial was a great help (just a walktrough):
http://khamsouk.souvanlasy.com/2007/5/1/ajax-file-uploads-in-rails-using-attachment_fu-and-responds_to_parent

maerzbow
http://blog.odeley.com

Hi
  And finally I suceeded in the file upload (ajaxway) using
responds_to_parent,uploadcolumn with iframe remoting pattern

Thanks for your help
Sijo