django override delete cascade for one time

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Is there an option for to make sure that a model instance does not have any related objects? i.e, if the Person object has any related objects, I want this line

person.delete()

to raise an error.

And I don't want to modify on_delete=models.CASCADE for every foreign key. I need this protection only here, for any other case in my application (like django admin site) I do prefer the cascading behavior.

django-queryset django-models django python
1 Answers

Does this correspond to what you want?

has_related = False
for field in person.__class__._meta.get_fields():
    if field.is_relation:
        field_name = field.get_accessor_name()
        model_field = getattr(person, field_name)
        if not isinstance(model_field, models.Model) and model_field.all():
            has_related = True
            break

if not has_related:
    person.delete()
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