/Python/Django/Django on delete set default

Django on delete set default

It depends on your business requirements. Should every Item always point to a valid Policy? And what's the requirement from business point-of-view when a Policy gets deleted? Should the Items pointing to it also be deleted? We don't know your requirements, so it's difficult to answer your question. These are your options from a technical perspective:

Set on_delete=CASCADE if you want the Item to be deleted when the Policy is deleted
Set on_delete=PROTECT if you don't want to allow any Policy to be deleted if there's still any Item pointing to it. In that case you'll have to try: policy.delete(); except ProtectedError: ... in your code to handle that situation.
Set on_delete=SET_DEFAULT if you know your default policy will not be deleted (you could override the delete method on Policy to avoid deleting the default policy).
Set on_delete=SET_NULL if an Item can have no Policy. That may be valid in certain business scenarios. But in this case you must also have null=True.

Similar codes

0 vote472 views2 answers
From django.core.management import execute_from_command_line ImportError: No module named django.core.management
Python Django
0 vote384 views3 answers
User serializer in django rest framework
Python Django
0 vote373 views1 answer
Django test postgres extensions intarray
Python Django
0 vote329 views1 answer
Remove last comma forloop django
Python Django
0 vote354 views1 answer
How to query json field django
Python Django
7 votes345 views2 answers
How to generate requirements.txt django
Python Django
0 vote380 views1 answer
Back button django template
Python Django
0 vote367 views1 answer
How to get parent model object based on child model filter in django
Python Django
2 votes380 views1 answer
Count the number of rows in a database table in Django
Python Django
5 votes373 views1 answer
How to override save method in django
Python Django