How did the signal post_save of Django determine that it was saved for the first time?

How to judge that the Django signal post_save is saved for the first time, I believe many inexperienced people do not know what to do about it. Therefore, this paper summarizes the causes and solutions of the problem. Through this article, I hope you can solve this problem.

Every time an instance of a model is generated, another model related to it is generated, and the signal is judged by the post_save, but the problem is that every time I modify that model, it generates a new model again, that is, it activates the signal post_save. So how can I tell that this signal is activated only when an instance of the model is generated for the first time?

You can pass that the parameter created in post_save is a Boolean variable, and if it is true, the record is newly created.

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