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from django.db.models.signals import post_save, post_delete from django.dispatch import receiver from .models import OrderLineItem @receiver(post_save, sender=OrderLineItem) def update_on_save(sender, instance, created, **kwargs): """ Update order total on lineitem update/create """ instance.order.update_total() @receiver(post_delete, sender=OrderLineItem) def update_on_delete(sender, instance, **kwargs): """ Update order total on lineitem delete """ instance.order.update_total()