sg101: potd/signals.py annotate

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bgneal@532	1 """
bgneal@532	2 Signal handlers for the potd application.
bgneal@532	3
bgneal@532	4 """
bgneal@532	5 from django.db.models.signals import post_save, post_delete
bgneal@532	6
bgneal@532	7 from potd.models import Photo, Sequence
bgneal@532	8
bgneal@532	9
bgneal@532	10 def on_photo_save(sender, **kwargs):
bgneal@532	11 """
bgneal@532	12 This function is executed when a Photo is saved. It inserts the photo into
bgneal@532	13 the current sequence.
bgneal@532	14
bgneal@532	15 """
bgneal@532	16 photo = kwargs['instance']
bgneal@532	17 Sequence.objects.insert_photo(photo.pk)
bgneal@532	18
bgneal@532	19
bgneal@532	20 def on_photo_delete(sender, **kwargs):
bgneal@532	21 """
bgneal@532	22 This function is executed when a Photo is deleted. It removes the photo from
bgneal@532	23 the current sequence of photos.
bgneal@532	24
bgneal@532	25 """
bgneal@532	26 photo = kwargs['instance']
bgneal@532	27 Sequence.objects.remove_photo(photo.pk)
bgneal@532	28
bgneal@532	29
bgneal@532	30 post_save.connect(on_photo_save, sender=Photo, dispatch_uid='potd.signals')
bgneal@532	31 post_delete.connect(on_photo_delete, sender=Photo, dispatch_uid='potd.signals')

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