What does pre_save and post_save do in django?

Question

I was looking at the documentation here, about pre_save and post_save in django. The documentation really does not provide much substance, so what does pre_save and post_save do?

Answer 1

You probably skipped the introduction to signals in the docs:

Django includes a “signal dispatcher” which helps allow decoupled applications get notified when actions occur elsewhere in the framework. In a nutshell, signals allow certain senders to notify a set of receivers that some action has taken place.

Let's say you want to create a slug you have basically two options:

• Override your model's save() method
• Use the pre_save signal of your model