Rails - Aug 2006 - file object treated as a string

I am trying to implement the uploading of a file to a remote server
 
My upload form looks like this:
 
<%= start_form_tag(:action => "save_image", :multipart =>
true) %>
 
  <td><b>Description</b> </td>
  <td><%= text_area("image", "descript",
"cols" => 33, "rows" => 5) %></td>
 
  <td><b>Image</b> </td>
  <td><%= file_field("image", "picture",
"size"=>"30") %></td>

  <td><%= submit_tag(" SUBMIT ") %></td>

<%= end_form_tag %>

 
This links to "save_image" action in the controller. Controller looks
like this:

        def save_image
                @image = Image.new(params[:image])
                # attempt to save entry in the db
                if @image.save
                        # info saved in db OK. Save file on the server
                        write_file(params[:image])
                        redirect_to(:controller => ''shto'',
:action => ''index'')
                else
                        render(:action => :get)
                end
        end
 
        def write_file(uploaded_file)
                        uploaded_file[''picture''].rewind
                       
File.open("pictures/upload/#{@image.id}.#{@image.extention}",
"wb") { |f| f.write(uploaded_file[''picture''].read) }
                end
        end

 
My image model looks like this:
 
class Image < ActiveRecord::Base

        def picture=(image_field)
                extname_dot = File.extname(image_field)
                self.extention = extname_dot.slice(1, extname_dot.length)
                self.submitDate = Time.now
        end
end

 
When I click the submit button on the form, it saves the image entry in the
database OK, but errors while trying to write the file to the server. The error
I get is the following:
 
undefined method `rewind'' for #<String:0x2aaaad062eb8>
 
It seems to be treating uploaded_file[''picture''] as a string
instead of a File object. I tried implementing this with Agile web development
rails book, and also tried using other examples on the web, it always comes down
to this issue. Perhaps I am missing something, or this has to do with my ruby
version or the fact that I''m running this on Apache...
 
Any help would be greatly appreciated.
 
Thanks!
 
...Ed
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