/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

0 vote241 views1 answer
Is cobol obsolete
Python
0 vote271 views2 answers
Generate random password django
Python Django
0 vote275 views3 answers
Django celery email
Python Django
0 vote228 views1 answer
Aws lambda environment variables python
Python
1 vote235 views2 answers
How to sort nested list in python
Python
0 vote237 views1 answer
Voice translate python
Python
10 votes234 views3 answers
Matplotlib axis labels
Python
0 vote241 views1 answer
Removes all the elements from a linked list python
Python
1 vote226 views1 answer
File to lowercase python
Python
8 votes246 views2 answers
New dataframe based on certain row conditions
Python