ruff/docs/rules/receiver-decorator-checker.md

receiver-decorator-checker (DJ013)

Derived from the flake8-django linter.

What it does

Checks that Django's @receiver decorator is listed first, prior to any other decorators.

Why is this bad?

Django's @receiver decorator is special in that it does not return a wrapped function. Rather, @receiver connects the decorated function to a signal. If any other decorators are listed before @receiver, the decorated function will not be connected to the signal.

Example

from django.dispatch import receiver
from django.db.models.signals import post_save

@transaction.atomic
@receiver(post_save, sender=MyModel)
def my_handler(sender, instance, created, **kwargs):
   pass

Use instead:

from django.dispatch import receiver
from django.db.models.signals import post_save

@receiver(post_save, sender=MyModel)
@transaction.atomic
def my_handler(sender, instance, created, **kwargs):
    pass