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from django.db import connection
from django.db.models import F, Value
from django.db.models.functions import Collate
from django.test import TestCase
from ..models import Author
class CollateTests(TestCase):
@classmethod
def setUpTestData(cls):
cls.author1 = Author.objects.create(alias="a", name="Jones 1")
cls.author2 = Author.objects.create(alias="A", name="Jones 2")
def test_collate_filter_ci(self):
collation = connection.features.test_collations.get("ci")
if not collation:
self.skipTest("This backend does not support case-insensitive collations.")
qs = Author.objects.filter(alias=Collate(Value("a"), collation))
self.assertEqual(qs.count(), 2)
def test_collate_order_by_cs(self):
collation = connection.features.test_collations.get("cs")
if not collation:
self.skipTest("This backend does not support case-sensitive collations.")
qs = Author.objects.order_by(Collate("alias", collation))
self.assertSequenceEqual(qs, [self.author2, self.author1])
def test_language_collation_order_by(self):
collation = connection.features.test_collations.get("swedish_ci")
if not collation:
self.skipTest("This backend does not support language collations.")
author3 = Author.objects.create(alias="O", name="Jones")
author4 = Author.objects.create(alias="Ö", name="Jones")
author5 = Author.objects.create(alias="P", name="Jones")
qs = Author.objects.order_by(Collate(F("alias"), collation), "name")
self.assertSequenceEqual(
qs,
[self.author1, self.author2, author3, author5, author4],
)
def test_invalid_collation(self):
tests = [
None,
"",
'et-x-icu" OR ',
'"schema"."collation"',
]
msg = "Invalid collation name: %r."
for value in tests:
with self.subTest(value), self.assertRaisesMessage(ValueError, msg % value):
Collate(F("alias"), value)
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