Rails - May 2006 - Validation in File Upload

I have an app whose admin allows users to upload PDFs to populate a 
"newsletter" section.

I''m having trouble getting validation to work properly.

I want to be sure that a name, description & file are specified in the 
form.

The app seems to catch the error and won''t write a row to the DB but it
will create a file sized 0KB in the upload folder and it won''t show the
error messages for that model. (using error_messages_for...)

CODE IS BELOW...Thanks

---CONTROLER----

  def add_newsletter
    @newsletter = Newsletter.new(params[:newsletter])
	  if @newsletter.save
		  flash[:notice] = "Added a newsletter: #{@newsletter.name}"
		  redirect_to(:action=>''newsletter'')
    end
  end

----MODEL----
class Newsletter < ActiveRecord::Base
  validates_presence_of :name, :summary, :filename

 def newsletter=(newsletter_field)
		self.filename = sanitize_filename(newsletter_field.original_filename)
    self.filename = Time.now.strftime("%H%M%S")+self.filename
		#self.data = element_field.read
	
File.open("#{RAILS_ROOT}/public/newsletters/#{self.filename}","wb")
{
|f| f.write(newsletter_field.read)}
	end


	private
	def sanitize_filename(value)
        just_filename = value.gsub(/^.*(\\|\/)/, '''')
        @filename = just_filename.gsub(/[^\w\.\-]/,''_'')
	end

end

--VIEW--
<h3>Add a New Newsletter</h3>
<%= form_tag({:action=>''add_newsletter''},
:multipart=>true) %>
<table>
<tr>
  <td>Title</td>
  <td><%=text_field(:newsletter,:name)%></td>
</tr>
<tr>
  <td>Publication Date</td>
 
<td><%=date_select(:newsletter,:pubDate,:order=>[:month,:day,:year])%></td>
</tr>
<tr>
  <td>PDF File</td>
  <td><%=file_field(:newsletter,:newsletter)%></td>
</tr>
<tr>
  <td valign="top">Description</td>
  <td><%=text_area(:newsletter,:summary)%></td>
</tr>
<tr>
  <td colspan="2"
align="right"><%=submit_tag("Add
Newsletter")%></td>
  </tr>
</table>
<%= end_form_tag %>

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