paperclip_validation_errors_monkey_patch.rb

class ActiveRecord::Base
  
  alias_method 'paperclip_valid?', 'valid?'
  
  def valid?
    ret = paperclip_valid?
  
    unless self.class.attachment_definitions.nil?
      self.class.attachment_definitions.each_key do |attachment|
        %w(_file_name _content_type _file_size).each do |suffix|
          error = errors.on("#{attachment}#{suffix}")
          unless error.nil?
            errors.add("#{attachment}", error)
          end
        end
      end
    end

    ret
  end

end

monkey patch to generate paperclip validation errors on attachment and not only attachment_suffix