Django 4.1 Signals Not Firing as Expected on Model Save
I'm refactoring my project and I'm working with an scenario where my Django signals are not being triggered as expected when saving instances of my model. I have a simple model `Profile` and a signal that is supposed to send a notification whenever a profile is created. However, it only works intermittently. Here’s the relevant code: ```python from django.db import models from django.db.models.signals import post_save from django.dispatch import receiver class Profile(models.Model): user = models.OneToOneField('auth.User', on_delete=models.CASCADE) bio = models.TextField(blank=True) @receiver(post_save, sender=Profile) def profile_created(sender, instance, created, **kwargs): if created: print(f'Profile created for {instance.user.username}') ``` In my views, I create a `Profile` instance like this: ```python def create_profile(request): user = User.objects.get(pk=request.POST['user_id']) profile = Profile.objects.create(user=user, bio=request.POST['bio']) ``` I've added debug statements inside the `profile_created` function, but they don't always appear in the console. I also checked the database and confirmed that the profile instances are being created as expected. After some troubleshooting, I found that this scenario seems to occur when a profile is created in a bulk operation or when using Django's `bulk_create()`. For example, when creating multiple profiles at once: ```python profiles = [Profile(user=user, bio='Bio 1'), Profile(user=user, bio='Bio 2')] Profile.objects.bulk_create(profiles) ``` In such cases, the signals do not trigger at all. Is this a known limitation of Django signals with bulk operations, or is there something I'm missing? Should I be handling notifications differently for bulk creations? Any tips or workarounds would be greatly appreciated, as I need to ensure that notifications are sent reliably without needing to manually trigger them after a bulk create. I'm using Django 4.1. Thanks in advance for your help! This is part of a larger web app I'm building. What are your experiences with this? I'm coming from a different tech stack and learning Python. What would be the recommended way to handle this?