Xxx.valid? still true after xxx.errors.add(...)?

Hi all

I have the following code in my controller:

    if @comment.valid?
      captcha_url =
"http://captchator.com/captcha/check_answer/#{captcha_code}/#{@comment.captcha}"
      result = open(captcha_url)
      unless result.read == "1"
        @comment.errors.add(:captcha, "Captcha wurde nicht korrekt
eingegeben")
        raise "#{@comment.valid?}"
      end
    end

Although I'm adding an error to :captcha, when I raise @comment.valid?
on the next line this still gives me true! Why is that? I just added an
error to @comment, didn't I?!

Thanks
Josh

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I'm sorry, this belongs to the RoR part of this forum... I'll re-post it
there.

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