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from django.db.models import Q 

from django.db.models.signals import post_delete 

 

from common.models import CharacterFanfic, Pairing 

 

 

def delete_pairings(sender, instance, using, **kwargs): 

Pairing.objects.filter(fanfic__id=instance.fanfic.id).filter(Q( 

character_one__id=instance.character.id) | Q( 

character_two__id=instance.character.id)).delete() 

 

 

post_delete.connect(delete_pairings, 

sender=CharacterFanfic)