#25754: queryset.distinct('field') doesn't raise "DISTINCT ON not supported"
when
it should
-------------------------------------+-------------------------------------
Reporter: yoyoma | Owner: nobody
Type: Bug | Status: closed
Component: Database layer | Version: 1.8
(models, ORM) |
Severity: Normal | Resolution: invalid
Keywords: distinct | Triage Stage:
| Unreviewed
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
-------------------------------------+-------------------------------------
Comment (by yoyoma):
bmispelon,
Correct. Running {{{isinstance(queryset)}}} should NOT evaluate the
queryset. However, placing {{{queryset}}} directly into the shell should
(e.g., the example that you said you tried - what version of
Django/Python/ipython are you running?).
The following was actually copy/pasted from my shell, this very moment:
{{{
In [4]: Answer.objects.distinct('text')
Out[4]:
In [5]: Answer.objects.distinct('query')
Out[5]:
In [6]: type(Answer.objects.distinct('query'))
Out[6]: django.db.models.query.QuerySet
}}}
Does that even look normal? Of course not. Unless an expression is
{{{None}}}, its shell representation is usually visible.
My model looks exactly like this:
{{{
class Answer(models.Model):
created_at = models.DateTimeField(
_('created at'),
default=timezone.now,
editable=False
)
updated_at = models.DateTimeField(_('updated at'), auto_now=True)
query = models.ForeignKey('queries.Query', verbose_name=_('query'))
text = models.TextField(_('text'))
}}}
There isn't a custom manager.
--
Ticket URL: <https://code.djangoproject.com/ticket/25754#comment:5>
Django <https://code.djangoproject.com/>
The Web framework for perfectionists with deadlines.
--
You received this message because you are subscribed to the Google Groups
"Django updates" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to [email protected].
To post to this group, send email to [email protected].
To view this discussion on the web visit
https://groups.google.com/d/msgid/django-updates/064.ac65fa4e95cba8755721390623198648%40djangoproject.com.
For more options, visit https://groups.google.com/d/optout.
