What are some common use cases for Django signals?

What are some common use cases for Django signals?

Django signals are used to allow decoupled applications to get notified when certain actions occur elsewhere in the application. Common use cases include user registration, saving data, and sending notifications.

Can you give me an example of a signal in action?

Sure! A common example is the post_save signal, which is triggered after a model's save() method is called. You can use it to send a welcome email after a new user registers.

How do I connect a signal to a function?

You can connect a signal to a function using the @receiver decorator. For example, @receiver(post_save, sender=User) connects the function to the post_save signal for the User model.

Are there any performance considerations when using signals?

Yes, using signals can introduce performance overhead, especially if the connected functions are complex or if there are many signals. It's important to keep them efficient.