47 lines
2.0 KiB
Python
47 lines
2.0 KiB
Python
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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(pk=self.python.pk)
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self.assertEqual(author.backward, '' if connection.features.interprets_empty_strings_as_nulls else None)
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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(authors.filter(name__reverse=self.john.name[::-1]), [self.john])
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self.assertCountEqual(authors.exclude(name__reverse=self.john.name[::-1]), [self.elena, self.python])
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def test_expressions(self):
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author = Author.objects.annotate(backward=Reverse(Trim('name'))).get(pk=self.john.pk)
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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(authors.filter(name__reverse__length__gt=7), [self.john, self.elena])
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self.assertCountEqual(authors.exclude(name__reverse__length__gt=7), [self.python])
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