FILE_FIELD issue

My rhtml looks like this (extract)

  <tr><td>File</td>
      <td><%= file_field(:document, 'file') %></td>
  </tr>
  <tr><td>Description:</td>
      <td><%= text_area(:document, 'description',
{:rows=>8, :cols=>40}) %></td>
  </tr>
  <tr><td>Category:</td>
      <td><%= select(:document, 'folder_id', @folders) %></td>
  </tr>

Params shows up in log as follows:

Parameters: {"commit"=>"Upload", "action"=>"create",
"document"=>{"folder_id"=>"1", "description"=>"some doc"},
"controller"=>"documents"}

Where did the 'file' params vanish? How come document[description] and
document[folder_id] are picked up but not document[file]?

Rajesh

Hi folks, any ideas on this one? Regards, Rajesh