Rails - Oct 2006 - Saving a file ... what's missing

I''m trying to do the classic file upload to a directory in my file 
system (public/drawings). I have the following:

In the view:
	<%= file_field ( "drawing", "drawingfile" ) %>

In the controller, in addition to the usual <model>.save, I have
        @drawing.save_drawing(params[:drawing][:drawingfile])

In the model, I have

	def save_drawing(inputfile)
		if inputfile.original_filename
File.open("#{RAILS_ROOT}/public/drawings/#{inputfile.original_filename}",
"wb") {
				|f| f.write(inputfile.read) }
		end
		inputfile
	end

The save_drawing routine is almost verbatim from the HowToUploadAFile 
document. It *IS* creating a file in the right location in the file 
system, but no data is being written to it (e.g. a zero length file).

What am I missing?

Thanks in advance
---Michael

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