*First of all did you try accessing the email subject with a dotted
notation?*
try
u = User.objects.all()
and
u[0].subject
On Sun, Jan 16, 2011 at 12:53 PM, Jari Pennanen <jari.penna...@gmail.com>wrote:
> Hi!
>
> Suppose following model:
>
> class UserEmail(models.Model):
> """User email"""
>
> user = models.ForeignKey(User, db_index=True,
> null=True, blank=True, editable=False)
> """User recieving the email"""
>
> added = models.DateTimeField(_("added"), auto_now_add=True)
> """Added to database"""
>
> subject = models.CharField(_('subject'), max_length=128)
> """Subject"""
>
> message = models.TextField(_('message'))
> """Message"""
>
> How can I retrieve list of users and their latest email subject?
>
> This almost works:
>
> User.objects.all()\
> .annotate(latest_email_added=Max('useremail__added'))
>
> But it does not give me the other fields of latest email such as
> subject, so I try to add other fields using extra:
> User.objects.all()\
> .annotate(latest_email_added=Max('useremail__added'))\
> .extra(select={'email_subject' : 'myapp_useremail.subject'})
>
> Suddenly it adds a GROUP BY to the query with a long list of fields
> that should not be there, which breaks everything, now I get multiple
> rows per user which is not wanted.
>
> If I try to modify the group_by manually, like this:
> a = User.objects.all()\
> .annotate(latest_email_added=Max('useremail__added'))\
> .extra(select={'email_subject' : 'dmusic_useremail.subject'});
> a.query.group_by = [('auth_user', 'id')];
> print a.query
>
> There is still one extra field in group by making it break:
> ... GROUP BY "auth_user"."id", (dmusic_useremail.subject)
>
> Can someone elaborate this behavior?
>
> Any help is appreciated, thanks!
>
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--
*Praveen Krishna R*
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