Rails - Aug 2007 - Raising errors in plugin-files or UploadColumn Validation

Hi all!

I have a problem with the validation of uploaded images, or, to be more
specific,  with raising errors from plug-in files. I am using
UploadColumn to upload pictures. Problem is that it won''t raise errors
when upload e.g. txt-files. It will say "Upload succesfull", the
time-stamp is updated only the picture hasn''t changed.

I looked through the code of the plugin and found:

#----File: upload_column.rb
#----Code
[begin]--------------------------------------------------------------------------------------------------------------------------------------
    # Note also that unlike RMagicks''s read, this method will return
nil
if the image cannot
    # be opened, it will not throw an Error, so you can happily
    # apply this, even if you aren''t sure that the file is an image.
    #
    # +process!+ is usually more useful, don''t use +procesrs+ unless
there is a good reason to!
    #
    # Remember to call GC.start after you are done processing the image,
to avoid memory leaks.
    def process
      # Load the file as a ImageMagick object, pass to block, return the
yielded result
      begin
        img = ::Magick::Image::read(self.path).first
      rescue Magick::ImageMagickError
        return nil
      end
      yield( img )
    end
#----Code
[end]----------------------------------------------------------------------------------------------------------------------------------------

Now I guess I''d just have to raise an error message substituting
"return
nil". Is that right? If so, how can I do that? I experimented a bit
around but with no success.

Hope you can help me! Big thanks in advance!

bluescript
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