#29527: Multi-column comparisons
-------------------------------------+-------------------------------------
Reporter: Ryan Hiebert | Owner: nobody
Type: New feature | Status: closed
Component: Database layer | Version: 2.0
(models, ORM) |
Severity: Normal | Resolution: needsinfo
Keywords: QuerySet.extra | Triage Stage:
| Unreviewed
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
-------------------------------------+-------------------------------------
Comment (by Simon Charette):
> With one caveat, I needed to add the LHS as a calculated column using
annotate, which is a bit of a kludge, which ends up returning annotated
data that I didn't really need.
FWIW this can now be avoided in two ways
1. Use `QuerySet.alias` instead of `.annotate`
2. Pass lookups directly to `filter`
{{{#!python
from django.db.models.lookups import GreaterThan
from django.db.models import Func, F, Subquery
class Row(Func):
function = 'ROW'
def after(queryset, value):
return (
queryset
.filter(GreaterThan(
Row('a', 'b', 'c', 'id'),
Subquery(queryset.filter(id=value).values('a', 'b', 'c',
'id'))
))
.order_by('a', 'b', 'c', 'id')
)
}}}
--
Ticket URL: <https://code.djangoproject.com/ticket/29527#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 view this discussion on the web visit
https://groups.google.com/d/msgid/django-updates/069.b8268ef72985bd29c71a5c96a61c587c%40djangoproject.com.
