/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 vote495 views1 answer
Exception Type: AssertionError Exception Value: Expected a `Response`, `HttpResponse` or `HttpStreamingResponse` to be returned from the view, but received a `<class 'django.db.models.query.QuerySet'>`
Python Django
2 votes341 views1 answer
Register modal in django admin
Python Django
2 votes346 views1 answer
Postgres django settings
Python Django
0 vote379 views1 answer
Show post id on django admin interface
Python Django
23 votes405 views3 answers
Install django rest framework
Python Django
0 vote380 views1 answer
Demploy django in vps
Python Django
0 vote398 views1 answer
Django template limit string length
Python Django
0 vote370 views2 answers
Generate random password django
Python Django
0 vote344 views1 answer
Django on_delete rules
Python Django
0 vote333 views1 answer
Django or
Python Django