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
# 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
img = ::Magick::Image::read(self.path).first
rescue Magick::ImageMagickError
return nil
yield( img )

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!


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