Django Book 翻译
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原文:
**Emit a pre_save signal.** This provides a notification that an object is about to be saved. You can register a listener that will be invoked whenever this signal is emitted. These signals are still in development and werent documented when this book went to press; check the online documentation for the latest information.
翻译:
**发出一个预存信号。** 它发出一个将要存储一个对象的通知。你可以注册一个监听程序,在信号发出的时候就会被调用。到本书出版时,这些信号仍在开发中并且没有文档化,请查看在线文档来获得最新的消息。
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