Save extra file metadata (carrierwave uploader)

gistfile1.rb

def save_file_details(file)
  model.document_original = file.original_filename if file.respond_to?(:original_filename)
  fields = {:document_type => file.content_type, :document_size => file.size}
  fields.each do |field, value|
    if model.has_attribute? field
      model.send("#{field}=", value)
    end
  end
end