django signals code example

Example 1: django signals post_save not working

save() in post save keep calling itself(recursive)
to solve this try:
Just use pre_save , you don't need to use .save() method inside it again.

Example 2: django builtin signals

django post_save signals

Let’s have a look on the post_save built-in signal. Its code lives in the django.db.models.signals module. This particular signal fires right after a model finish executing its save method.

from django.contrib.auth.models import User
from django.db.models.signals import post_save

def save_profile(sender, instance, **kwargs):
    instance.profile.save()

post_save.connect(save_profile, sender=User)

Another way to register a signal, is by using the @receiver decorator:
 
from django.contrib.auth.models import User
from django.db.models.signals import post_save
from django.dispatch import receiver

@receiver(post_save, sender=User)
def save_profile(sender, instance, **kwargs):
    instance.profile.save()

Example 3: django signals

what are django signals?

The Django Signals is a strategy to allow decoupled applications to get notified when certain events occur

There are two key elements in the signals machinary: the senders and the receivers. As the name suggests, the sender is the one responsible to dispatch a signal, and the receiver is the one who will receive this signal and then do something.

A receiver must be a function or an instance method which is to receive signals.

A sender must either be a Python object, or None to receive events from any sender.

The connection between the senders and the receivers is done through “signal dispatchers”, which are instances of Signal, via the connect method.
So to receive a signal, you need to register a receiver function that gets called when the signal is sent by using the Signal.connect() method.

Example 4: django builtin signals

django built-in signals 

Django's built-in Signals:
Django provides a set of built-in signals that let user code get notified by Django itself of certain actions. These include some useful notifications:

django.db.models.signals.pre_save & django.db.models.signals.post_save : Sent before or after a model's save() method is called
django.db.models.signals.pre_delete & django.db.models.signals.post_delete : Sent before or after a model's delete() method or queryset's delete() method is called
django.db.models.signals.m2m_changed : Sent when a ManyToManyField on a model is changed
django.core.signals.request_started & django.core.signals.request_finished : Sent when Django starts or finishes an HTTP request