- September 26, 2008
- voting denormalization
- 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)