code: def to_internal_value(self, data):
          
          if self.kwargs['many']:
              serializer = self.serializer.child
              if not isinstance(data, list):
                  raise ParseError("'%s' value must be a list" % self.field_name)
              return [
                  self.to_internal_value_single(
                      instance,
                      serializer
                  ) for instance in data
              ]
          return self.to_internal_value_single(data, self.serializer)
docs: Return the underlying object(s), given the serialized form.