/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 vote172 views2 answers
The module in NAME could not be imported: django.contrhtmlib.auth.password_validation.UserAttributeSimilarityValidator. Check your AUTH_PASSWORD_VALIDATORS setting.
Python Django
1 vote174 views1 answer
What is values_list in django orm
Python Django
0 vote188 views1 answer
Django serializer exclude fields
Python Django
4 votes169 views2 answers
Loginrequiredmixin django
Python Django
1 vote179 views2 answers
Django queryset exists
Python Django
0 vote178 views1 answer
Get date only from datetimefiel django
Python Django
0 vote155 views2 answers
Check anonim user django
Python Django
0 vote188 views1 answer
Hpw to create related model in django rest framework logic
Python Django
0 vote164 views1 answer
Django authenticate with email
Python Django
1 vote181 views2 answers
Redirect to the same page django
Python Django