#31058: Ordering by the result of RawSQL with F expression and distinct
-------------------------------------+-------------------------------------
Reporter: wilhelmhb | Owner: nobody
Type: Bug | Status: new
Component: Database | Version: 2.2
layer (models, ORM) | Keywords: RawSQL, ordering,
Severity: Normal | expression
Triage Stage: | Has patch: 0
Unreviewed |
Needs documentation: 0 | Needs tests: 0
Patch needs improvement: 0 | Easy pickings: 0
UI/UX: 0 |
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Hi,
I run into an exception when combining `RawSQL`, `distinct` and `order_by`
with an expression:
{{{
ids = [10]
params = (tuple(ids), )
queryset = Item.objects.annotate(
score=RawSQL("""
SELECT SUM(id) AS score
FROM app_item
WHERE id IN %s""",
params=params,
output_field=FloatField()),
).order_by(F("score").desc(nulls_last=True)).distinct()
print(queryset.query)
}}}
where `Item` is any model you want, as I'm only using its `id`.
The exact exception is: `TypeError: not all arguments converted during
string formatting`
The exception seems due to the `sql_with_params` method of
`django.db.models.sql.Query` duplicating the `params` one time too many :
a `print(params)` at line 257 in django/db/models/sql/query.py outputs
`(('10',), ('10',), ('10',))`, while the query has only two placeholders.
I'm running Django 2.2.6
--
Ticket URL: <https://code.djangoproject.com/ticket/31058>
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