/Python/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

1 vote141 views1 answer
How to put in code to download discord py
Python
0 vote173 views1 answer
Prefetched_related django rest framework
Python Django
9 votes166 views2 answers
Python write yaml
Python
19 votes186 views5 answers
Autoclicker in python
Python
-1 vote184 views1 answer
Set form field disabled django
Python Django
0 vote140 views1 answer
What is comma in regex
Python
16 votes246 views4 answers
List to dataframe columns
Python
0 vote144 views1 answer
Multiplication table with three lines of code in python
Python
11 votes206 views4 answers
Cv2 rgb to bgr
Python
1 vote132 views1 answer
Mypy ignore type
Python