types.py 文件源码

def is_type_of(cls, root, info):
        if isinstance(root, SimpleLazyObject):
            root._setup()
            root = root._wrapped
        if isinstance(root, cls):
            return True
        if not is_valid_django_model(type(root)):
            raise Exception((
                'Received incompatible instance "{}".'
            ).format(root))
        model = root._meta.model
        return model == cls._meta.model