Convert utf-8 to chinese in ruby on rails

Sample code to send a utf-8 string in subject line of email. Its pretty simple and straight forward   def send_to_lead(lead_email, from_email, from_name, offer_id, club_id, customer_id) @customer_name = from_name @customer_email = from_email str = “期待很快就可!” #    str= “subject in english”