run code after transaction commit in Django
One possibility would be to subclass the transaction middleware so that it sends a custom signal on commit. Your code could listen for that signal, rather than post_save.
Hope this may help someone using Django 1.9 or later. Since 1.9 on_commit is available.
So basically you would be doing it like this:
from django.db import transaction
transaction.on_commit(
lambda: send_msg_to_rabbitmqp(param1, param2, ...)
)
If you wish to keep post_save
, you can still use on_commit
:
@receiver(pre_save, sender=MyModel)
def my_handler(sender, instance, created, **kwargs):
transaction.on_commit(
lambda: send_msg_to_rabbitmqp(instance.id)
)
I have implemented transaction signals (post_commit
and post_rollback
) by monkey patching django:
http://gist.github.com/247844
django-transaction-hooks solves this problem for Django < 1.9, and the functionality is built into Django 1.9+:
from django.db import transaction
def do_something():
pass # send a mail, invalidate a cache, fire off a Celery task, etc.
transaction.on_commit(do_something)