Rails - Jan 2006 - Creating versions with file_column but only if file is image

I would like to create versions of images uploaded to a model that has a 
file_column but only if the file is a image.

file_column :file, :magick => { :versions => {"thumb" =>
"64x64"}}

If I upload a txt file this will give me an error of "File invalid 
image".


Any idears?

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