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Is there a built in way to convert a string so it is safe in a url?
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Yes. A UUID consists of only hexadecimal characters (a–f, 0–9) plus a hyphen (-). As per RFC 3986 (URI Syntax) §2.3, hyphen and hexadecimal characters are included in those explicitly unreserved: Characters that are allowed in a URI but do not have a reserved purpose are called unreserved.
If you need to encode query strings then CGI. escape method is probably what you're looking for. CGI. escape follows the CGI/HTML forms spec and returns a string like application/x-www-form-urlencoded requests, which requires spaces to be escaped to + and encode most special characters.
CGI. escape is for escaping a URL value in the query string. All characters that don't fall into the ALPHA, DIGIT, '_', '-', '.
CGI::escape()
To decode: CGI::unescape()
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