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