code: def unwrap(self, value, fields=None, session=None):
          ''' If ``autoload`` is False, return a DBRef object.  Otherwise load
              the object.
          '''
          self.validate_unwrap(value)
          value.type = self.type
          return valuf unwrap(self, value, fields=None, session=None):
          ''' If ``autoload`` is False, return a DBRef object.  Otherwise load
              the object.
          '''
          self.validate_unwrap(value)
          value.type = self.type
          return value
docs: If ``autoload`` is False, return a DBRef object.  Otherwise load
              the object.