orm.py 文件源码

def __enter__(self):
        if len(self.hooks) > 0:
            # Capture a textual description of the hooks to help us understand
            # why this is about to blow oodles of egg custard in our faces.
            description = "\n".join(gen_description_of_hooks(self.hooks))
            # Crash when there are orphaned post-commit hooks. These might
            # only turn up in testing, where transactions are managed by the
            # test framework instead of this decorator. We need to fail hard
            # -- not just warn about it -- to ensure it gets fixed.
            self.reset()
            raise TransactionManagementError(
                "Orphaned post-commit hooks found:\n" + description)