docs: def populate(self, deserialized_txs=None, filename=None, retry=None):
          """Populates the batch with unsaved model instances
          from a generator of deserialized objects.
          """
          if not deserialized_txs:
              raise BatchError("Failed to populate batch. There are no objects to add.")
          self.filename = filename
          if not self.filename:
              raise BatchError("Invalid filename. Got None")
          try:
              for deserialized_tx in deserialized_txs:
                  self.peek(deserialized_tx)
                  self.objects.append(deserialized_tx.object)
                  break
              for deserialized_tx in deserialized_txs:
                  self.objects.append(deserialized_tx.object)
          except DeserializationError as e:
              raise BatchDeserializationError(e) from e
          except JSONFileError as e:
              raise BatchDeserializationError(e) from e