@classmethod
def _process_foreign_keys(cls, foreign_keys, node_data):
    """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
        """
    for key in foreign_keys.keys():
        if key in node_data:
            node_data[key] = foreign_keys[key].objects.get(pk=node_data[key])
