def added?(attribute, message = nil, options = {})
      message = normalize_message(attribute, message, options)
      self[attribute].include? message
    end
def added?(attribute, message = nil, options = {})
      message = normalize_message(attribute, message, options)
      self[attribute].include? message
    end
Returns true if an error on the attribute with the given message is present, false otherwise.
 +message+ is treated the same as for +add+.
   p.errors.add :name, :blank
   p.errors.added? :name, :blank # => true