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请问下消息通知是用什么方法呢？看网上都是一些消息追踪一类的。我继承mail模型，想着每走一步流程发送消息通知，message_post方法发送怎么才能显示在菜单栏消息里呢？
![Q3[{444PO5]{3D2207TF`O6.png](/assets/uploads/files/1592790989045-q3-444po5-3d2207tf-96-o6.png)