/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

1 vote134 views2 answers
Join two querysets django
Python Django
0 vote133 views1 answer
Create django model field based on another field
Python Django
0 vote150 views1 answer
Django clodinarystorage
Python Django
1 vote153 views2 answers
Management command in django
Python Django
0 vote127 views10 answers
EMAIL_BACKEND = 'django.core.mail.backends.console.EmailBackend'
Python Django
1 vote134 views1 answer
Django gunicorn static file not found
Python Django
3 votes159 views3 answers
Django.db.utils.OperationalError: no such table:
Python Django
3 votes150 views1 answer
Business logic in django
Python Django
0 vote144 views1 answer
Django serializer,
Python Django
1 vote127 views1 answer
Sum values in django models
Python Django