Thanks! I don't see how the link you provided justifies your point. I don't see anything in there saying that specifying an ordering will subsume group by statements. How did you know this was expected?
But..in any case I'm happy to take your word for it. And thanks a bunch for the workaround! -Eric On Wednesday, June 29, 2016 at 3:12:08 PM UTC-7, Fabio Caritas Barrionuevo da Luz wrote: > > Hi Eric. > > This is the expected behavior ( > https://docs.djangoproject.com/en/dev/ref/models/options/#ordering > <https://www.google.com/url?q=https%3A%2F%2Fdocs.djangoproject.com%2Fen%2Fdev%2Fref%2Fmodels%2Foptions%2F%23ordering&sa=D&sntz=1&usg=AFQjCNGjRz94PLprtXEe4suPC6-zf3YWJg> > ). > > If ordering is defined on model Meta, the ORDER BY SQL is included by > default in all query. > > to avoid this behavior, you can use order_by() without parameters: > > eg: > > A.objects.order_by().values('b').annotate(most_recent=Max('created_at')) > > > > On Wed, Jun 29, 2016 at 5:39 PM, eric conner <ericw...@gmail.com > <javascript:>> wrote: > >> Hello! >> >> I'm using Django 1.9.7, MySQL innodb 5.7.11, and python 2.7.10. >> >> I noticed some strange behavior when running this query: >> q = A.objects.values('b').annotate(most_recent=Max('created_at')) >> >> Produces this SQL: >> SELECT `core_a`.`b_id`, MAX(`core_a`.`created_at`) AS `most_recent` FROM >> `core_a` GROUP BY `core_a`.`id` ORDER BY `core_a`.`id` ASC >> >> which groups by an unexpected field. I was expecting it to group by >> `core_a`.`b_id` rather than `core_a`.`id`. >> >> Here are my models: >> from __future__ import unicode_literals >> >> from django.db import models >> from django.utils import timezone >> >> >> class B(models.Model): >> created_at = models.DateTimeField(default=timezone.now) >> >> >> class A(models.Model): >> created_at = models.DateTimeField(default=timezone.now) >> b = models.ForeignKey(B) >> >> class Meta: >> ordering = ["id"] >> >> >> If I remove from model A these lines >> class Meta: >> ordering = ["id"] >> then the query produces SQL which groups by the b_id column as expected. >> >> Is this known behavior? Would this be considered a bug? >> >> Thanks, >> -Eric >> >> -- >> You received this message because you are subscribed to the Google Groups >> "Django users" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to django-users...@googlegroups.com <javascript:>. >> To post to this group, send email to django...@googlegroups.com >> <javascript:>. >> Visit this group at https://groups.google.com/group/django-users. >> To view this discussion on the web visit >> https://groups.google.com/d/msgid/django-users/d06683cc-ea7b-43db-a23b-0ebbd19bd424%40googlegroups.com >> >> <https://groups.google.com/d/msgid/django-users/d06683cc-ea7b-43db-a23b-0ebbd19bd424%40googlegroups.com?utm_medium=email&utm_source=footer> >> . >> For more options, visit https://groups.google.com/d/optout. >> > > > > -- > Fábio C. Barrionuevo da Luz > Palmas - Tocantins - Brasil - América do Sul > > http://pythonclub.com.br/ > > Blog colaborativo sobre Python e tecnologias Relacionadas, mantido > totalmente no https://github.com/pythonclub/pythonclub.github.io . > > Todos são livres para publicar. É só fazer fork, escrever sua postagem e > mandar o pull-request. Leia mais sobre como publicar em README.md e > contributing.md. > Regra básica de postagem: > "Você" acha interessante? É útil para "você"? Pode ser utilizado com > Python ou é útil para quem usa Python? Está esperando o que? Publica logo, > que estou louco para ler... > > -- You received this message because you are subscribed to the Google Groups "Django users" group. To unsubscribe from this group and stop receiving emails from it, send an email to django-users+unsubscr...@googlegroups.com. To post to this group, send email to django-users@googlegroups.com. Visit this group at https://groups.google.com/group/django-users. To view this discussion on the web visit https://groups.google.com/d/msgid/django-users/c2c8ea58-a55a-47bc-97a3-1ea19602a988%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
