/Python/Django/Django pre_save get old instance

Django pre_save get old instance

@receiver(pre_save, sender=A)
def signal_product_manage_latest_version_id(sender, instance, update_fields=None, **kwargs):
    try:
        old_instance = A.objects.get(id=instance.id)
    except A.DoesNotExist:  # to handle initial object creation
        return None  # just exiting from signal
    # your code to with 'old_instance'

Source: stackoverflow.com

Similar codes

2 votes404 views1 answer
No module named social_django
Python Django
1 vote334 views2 answers
Join two querysets django
Python Django
12 votes381 views6 answers
Model in django
Python Django
0 vote393 views1 answer
Django validate_comma_separated_integer_list
Python Django
0 vote385 views1 answer
Run django using nssm
Python Django
2 votes396 views1 answer
Django static media
Python Django
0 vote393 views3 answers
How to create a User and User profile in django rest framework
Python Django
0 vote392 views1 answer
Merge two Querysets in Python Django while preserving Queryset methods
Python Django
28 votes495 views1 answer
Import "matplotlib" could not be resolved django
Python Django
1 vote339 views3 answers
Django logout user
Python Django