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from unittest import SkipTest
import django
from django.db import OperationalError, ProgrammingError
from django.db.models import Window
from django.db.models.functions import Rank
from django.test import TestCase
from django_cte import CTE, with_cte
from .models import Order, Region
class WindowFunctions(TestCase):
def test_heterogeneous_filter_in_cte(self):
if django.VERSION < (4, 2):
raise SkipTest("feature added in Django 4.2")
cte = CTE(
Order.objects.annotate(
region_amount_rank=Window(
Rank(), partition_by="region_id", order_by="-amount"
),
)
.order_by("region_id")
.values("region_id", "region_amount_rank")
.filter(region_amount_rank=1, region_id__in=["sun", "moon"])
)
qs = with_cte(cte, select=cte.join(Region, name=cte.col.region_id))
print(qs.query)
# ProgrammingError: column cte.region_id does not exist
# WITH RECURSIVE "cte" AS (SELECT * FROM (
# SELECT "orders"."region_id" AS "col1", ...
# "region" INNER JOIN "cte" ON "region"."name" = ("cte"."region_id")
try:
self.assertEqual({r.name for r in qs}, {"moon", "sun"})
except (OperationalError, ProgrammingError) as err:
if "cte.region_id" in str(err):
raise SkipTest(
"window function auto-aliasing breaks CTE "
"column references"
)
raise
if django.VERSION < (5, 2):
assert 0, "unexpected pass"
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