base.py 文件源码

def model_unpickle(model_id, attrs, factory):
    """
    Used to unpickle Model subclasses with deferred fields.
    """
    if isinstance(model_id, tuple):
        if not apps.ready:
            apps.populate(settings.INSTALLED_APPS)
        model = apps.get_model(*model_id)
    else:
        # Backwards compat - the model was cached directly in earlier versions.
        model = model_id
    cls = factory(model, attrs)
    return cls.__new__(cls)