I am trying to implement an activity feed following this tutorial.
I would like to delete an acitivity(ie a comment has been added)when the corresponding object, ie the comment itself, has been removed. This doesn't seem to cascade.
Is there any way to achieve this without adding a GenericRelation? It is possible to delete the corresponding activity by using postdelete signal. Is that the best way?
Yes you can, but maybe it's better using a pre_delete signal because you will be able to access to the instance pk.
from django.contrib.contenttypes.models import ContentType
from django.db.models.signals import pre_delete
from django.dispatch import receiver
from yourapp.models import Comment, Activity
@receiver(pre_delete, sender=Comment)
def pre_delete_receiver(sender, instance,**kwargs):
# code that delete the related objects
# As you don't have generic relation you should manually
# find related actitities
ctype = ContentType.objects.get_for_model(instance)
Activity.objects.filter(content_type=ctype, object_id=instance.pk).delete()
