Pig Latin Refinement

pig_latin.rb

def translate(pigstri)
    vowels = [ "a", "e", "i", "o", "u", "y" ]
    pigstri
        .split(/ /, -1)
        .map { |x|
            first_vowel = x.chars.find_index { |x| vowels.include?(x) }
            if vowels.include?(x[0])
                x + "ay"
            elsif x[0..1].include?("qu")
                x[2..x.length] + x[0..1] + "ay"
            else
                x[first_vowel..-1] + x[0..(first_vowel - 1)] + "ay"
            end
        }.join(" ")
end