7.8. Signals

7.8.1. Available signals

7.8.2. Model signals

• django.db.models.signals.pre_init

• django.db.models.signals.post_init

• django.db.models.signals.pre_save

• django.db.models.signals.post_save

• django.db.models.signals.pre_delete

• django.db.models.signals.post_delete

7.8.3. M2m relations

• django.db.models.signals.m2m_changed

• django.db.models.signals.class_prepared

7.8.4. Migrations

• django.db.models.signals.pre_migrate

• django.db.models.signals.post_migrate

7.8.5. Request

• django.core.signals.request_started

• django.core.signals.request_finished

• django.core.signals.got_request_exception

7.8.6. Test

• django.test.signals.setting_changed

• django.test.signals.template_rendered

7.8.7. Database

• django.db.backends.signals.connection_created

7.8.8. Examples

from django.db.models.signals import pre_save
from django.dispatch import receiver
from myapp.models import MyModel


@receiver(pre_save, sender=MyModel)
def my_handler(sender, **kwargs):
    ...

from django.apps import AppConfig
from django.db.models.signals import post_migrate

def my_callback(sender, **kwargs):
    # Your specific logic here
    pass

class MyAppConfig(AppConfig):
    ...

    def ready(self):
        post_migrate.connect(my_callback, sender=self)