Django ORM bug: overloading delete() method of models

[Bobosher]

I have overloaded delete() method of my model to enable soft deletion so that delete() method just sets is_deleted field to be true and calls build-in save() method.
It's working fine against individual model objects:

my_object = MyModel.objects.get(id=1)
my_object.delete() # Works fine, the object isn't actually deleted.

But when I called delete() method directly for a queryset, it just hard-deleted those objects included in the queryset:

some_objects = MyModel.objects.filter(id__lte=10)
some_objects.delete() # Those objects are actually deleted from the database.

[Mariusz Felisiak]

Model.delete() is not called when deleting objects in bulk using QuerySet.delete(), see ​Overriding predefined model methods for more details.

[Bobosher]

Replying to Mariusz Felisiak:

Model.delete() is not called when deleting objects in bulk using QuerySet.delete(), see ​Overriding predefined model methods for more details.

Thank you a lot.