def camel_case(input)
      input.to_s.split(/_/).map { |i|
        i.sub(/^./) { |s| s.upcase }
      }.join
    end
def camel_case(input)
      input.to_s.split(/_/).map { |i|
        i.sub(/^./) { |s| s.upcase }
      }.join
    end
Change a ruby_cased string to CamelCased