| 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) |
|
|
