I just found an interesting solution of this problem
Check this blog post.
http://henrik.nyh.se/2008/10/validating-slugs-against-existing-routes-in-rails

On 17 Paź, 16:37, rumianek <[EMAIL PROTECTED]> wrote:
> It is possible to register i.e. as 'categories'. In fact I just did it
> athttp://communityengine.missingmethod.com/
> Obviously it should not be possible.
> Does someone knows a solution? I think of custom validator that could
> check also for profanity in logins. I did found fu-fu plugin but this
> works as a filter only not validator.
>
> jr
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