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Asked: 2026-05-11T03:33:52+00:00

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

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class Message(models.Model):     subject = models.CharField(max_length=100)     pub_date = models.DateTimeField(default=datetime.now())  class Topic(models.Model):     title = models.CharField(max_length=100)     message = models.ManyToManyField(Message, verbose_name='Discussion')

I want to get order all the topics according to the latest message object attached to that topic. I executed this query but this does not give the distinct queryset.

>> Topic.objects.order_by('-message__pub_date').distinct()
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1 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.

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