code: def _process_foreign_keys(cls, foreign_keys, node_data):
          
          for key in foreign_keys.keys():
              if key in node_data:
                  node_data[key] = foreign_keys[key].objects.get(
                      pk=node_data[key])
docs: For each foreign key try to load the actual object so load_bulk
          doesn't fail trying to load an int where django expects a
          model instance