# File lib/paperclip.rb, line 371
    def validates_attachment_size name, options = {}
      min     = options[:greater_than] || (options[:in] && options[:in].first) || 0
      max     = options[:less_than]    || (options[:in] && options[:in].last)  || (1.0/0)
      range   = (min..max)
      message = options[:message] || "must be between :min and :max bytes"
      message = message.call if message.respond_to?(:call)
      message = message.gsub(/:min/, min.to_s).gsub(/:max/, max.to_s)

      validates_inclusion_of "#{name}_file_size""#{name}_file_size",
                             :in        => range,
                             :message   => message,
                             :if        => options[:if],
                             :unless    => options[:unless],
                             :allow_nil => true
    end