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Simple Signal to denormalize vote counts in django-voting

Author:
ericmoritz
Posted:
September 26, 2008
Language:
Python
Version:
1.0
Tags:
voting denormalization
Score:
1 (after 1 ratings)

This attaches a signal to the save and delete signals for the Vote object and recalculates the score for the object and stores it in that object's vote_score attribute.

This allows you to have a list of those objects and not have to calculate in the database the vote score for each object.

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# Register some signal handlers
def denormalize_votes(sender, instance, created=False, **kwargs):
    """This recalculates the vote total for the object
    being voted on"""
    instance.object.vote_score = Vote.objects.get_score(instance.object)['score']
    instance.object.save()

models.signals.post_save.connect(denormalize_votes, sender=Vote)
models.signals.post_delete.connect(denormalize_votes, sender=Vote)

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