mirror of https://github.com/django/django.git
63 lines
2.2 KiB
Python
63 lines
2.2 KiB
Python
from django.db import connection
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from django.db.models import CharField
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from django.db.models.functions import Length, Reverse, Trim
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from django.test import TestCase
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from django.test.utils import register_lookup
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from ..models import Author
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class ReverseTests(TestCase):
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@classmethod
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def setUpTestData(cls):
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cls.john = Author.objects.create(name="John Smith", alias="smithj")
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cls.elena = Author.objects.create(name="Élena Jordan", alias="elena")
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cls.python = Author.objects.create(name="パイソン")
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def test_null(self):
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author = Author.objects.annotate(backward=Reverse("alias")).get(
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pk=self.python.pk
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)
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self.assertEqual(
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author.backward,
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"" if connection.features.interprets_empty_strings_as_nulls else None,
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)
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def test_basic(self):
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authors = Author.objects.annotate(backward=Reverse("name"))
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self.assertQuerySetEqual(
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authors,
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[
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("John Smith", "htimS nhoJ"),
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("Élena Jordan", "nadroJ anelÉ"),
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("パイソン", "ンソイパ"),
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],
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lambda a: (a.name, a.backward),
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ordered=False,
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)
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def test_transform(self):
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with register_lookup(CharField, Reverse):
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authors = Author.objects.all()
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self.assertCountEqual(
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authors.filter(name__reverse=self.john.name[::-1]), [self.john]
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)
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self.assertCountEqual(
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authors.exclude(name__reverse=self.john.name[::-1]),
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[self.elena, self.python],
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)
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def test_expressions(self):
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author = Author.objects.annotate(backward=Reverse(Trim("name"))).get(
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pk=self.john.pk
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)
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self.assertEqual(author.backward, self.john.name[::-1])
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with register_lookup(CharField, Reverse), register_lookup(CharField, Length):
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authors = Author.objects.all()
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self.assertCountEqual(
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authors.filter(name__reverse__length__gt=7), [self.john, self.elena]
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)
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self.assertCountEqual(
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authors.exclude(name__reverse__length__gt=7), [self.python]
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)
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