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I want to see if my title field changed in a save method. Here is what I have so far:

class Answer(models.Model): title = models.CharField(max_length=200) description = models.TextField() def save(self, *args, **kwargs): if self.pk: answer_prev = Answer.objects.get(pk=self.pk) if answer_rev.title != self.title: log.info('TITLE HAS CHANGED!!')

Is there a better way to do this?

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I think the best solution is use django model pre_save signal.

Before save, instance in db is still original one, but instance param has the new values, so you can check if a field has changed.

from django.db import models from django.dispatch import receiver @receiver(models.signals.pre_save, sender=Answer) def prepare_save(sender, instance, **kwargs): try: current_instance = sender.objects.get(pk=instance.pk) if current_instance.title != instance.title: print 'Title changed to %s!' % instance.title except sender.DoesNotExist: print 'new answer. No title change'
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