/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

0 vote202 views1 answer
Cbv uk django
Python Django
0 vote150 views1 answer
Gunicorn django static files
Python Django
0 vote148 views1 answer
Taggablemanager serializer django
Python Django
0 vote163 views2 answers
How to avoid inserting duplicate records in orm django
Python Django
0 vote97 views1 answer
Summation django queryset
Python Django
2 votes181 views1 answer
How to return total elements in database django
Python Django
0 vote161 views1 answer
Windows 10 reset django migrations
Python Django
0 vote164 views1 answer
Abstract user in django
Python Django
0 vote164 views1 answer
Django builtin signals
Python Django
0 vote201 views1 answer
Django only certain columns from database
Python Django