You don't need experience with Ruby specifically, you just need to be able to "pick up a new language faster than your laundry" and likely have experience with

You don't need experience with Ruby specifically, you just need to be able to "pick up a new language faster than your laundry" and likely have experience with a similar language. If they interview a candidate with a decade of experience in Perl, Python, and Java, but no experience with Ruby, that would be fine as long as he is a fast learner who would be comfortable adapting to Ruby.