What are Django signals and how do they work?

What are Django signals and how do they work?

Django signals are a way to allow decoupled applications to get notified when certain actions occur elsewhere in the application. They are used to send notifications when certain events happen, like saving a model instance.

Can you give me an example of how to use signals in Django?

Sure! For example, you can use the post_save signal to perform an action right after a model instance is saved. You would connect a receiver function to this signal.

What is a receiver function in this context?

A receiver function is a function that gets called when a signal is sent. It takes the sender and instance as arguments, allowing you to perform actions based on the saved instance.

Are there any built-in signals in Django?

Yes, Django provides several built-in signals like pre_save, post_save, pre_delete, and post_delete, among others.