| from django.db.models import CharField |
| from django.db.models.functions import Length |
| from django.test import TestCase |
| from django.test.utils import register_lookup |
|
|
| from ..models import Author |
|
|
|
|
| class LengthTests(TestCase): |
| def test_basic(self): |
| Author.objects.create(name="John Smith", alias="smithj") |
| Author.objects.create(name="Rhonda") |
| authors = Author.objects.annotate( |
| name_length=Length("name"), |
| alias_length=Length("alias"), |
| ) |
| self.assertQuerySetEqual( |
| authors.order_by("name"), |
| [(10, 6), (6, None)], |
| lambda a: (a.name_length, a.alias_length), |
| ) |
| self.assertEqual(authors.filter(alias_length__lte=Length("name")).count(), 1) |
|
|
| def test_ordering(self): |
| Author.objects.create(name="John Smith", alias="smithj") |
| Author.objects.create(name="John Smith", alias="smithj1") |
| Author.objects.create(name="Rhonda", alias="ronny") |
| authors = Author.objects.order_by(Length("name"), Length("alias")) |
| self.assertQuerySetEqual( |
| authors, |
| [ |
| ("Rhonda", "ronny"), |
| ("John Smith", "smithj"), |
| ("John Smith", "smithj1"), |
| ], |
| lambda a: (a.name, a.alias), |
| ) |
|
|
| def test_transform(self): |
| with register_lookup(CharField, Length): |
| Author.objects.create(name="John Smith", alias="smithj") |
| Author.objects.create(name="Rhonda") |
| authors = Author.objects.filter(name__length__gt=7) |
| self.assertQuerySetEqual( |
| authors.order_by("name"), ["John Smith"], lambda a: a.name |
| ) |
|
|
