django-avatar/avatar/__init__.py

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from django.contrib.auth.models import User
from models import Avatar
from django.dispatch import dispatcher
from django.db.models import signals
def create_avatar(sender, instance):
avatar, created = Avatar.objects.get_or_create(user=instance)
avatar.save()
def delete_avatar(sender, instance):
try:
Avatar.objects.get(user=instance).delete()
except Avatar.DoesNotExist:
pass
dispatcher.connect(create_avatar, sender=User, signal=signals.post_save)
dispatcher.connect(delete_avatar, sender=User, signal=signals.post_delete)