Queryset API distinct() does not work?

Question

class Message(models.Model):
    subject = models.CharField(max_length=100)
    pub_date = models.DateTimeField(default=datetime.now())

class Topic(models.Model):
          


        

Answer 1

You'll find the explanation in the documentation for .distinct().

I would de-normalize by adding a modified_date field to the Topic model and updating it whenever a Message is saved or deleted.