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from django.db.models import CharField
from django.db.models.functions import LTrim, RTrim, Trim
from django.test import TestCase
from django.test.utils import register_lookup
from ..models import Author
class TrimTests(TestCase):
def test_trim(self):
Author.objects.create(name=' John ', alias='j')
Author.objects.create(name='Rhonda', alias='r')
authors = Author.objects.annotate(
ltrim=LTrim('name'),
rtrim=RTrim('name'),
trim=Trim('name'),
)
self.assertQuerysetEqual(
authors.order_by('alias'), [
('John ', ' John', 'John'),
('Rhonda', 'Rhonda', 'Rhonda'),
],
lambda a: (a.ltrim, a.rtrim, a.trim)
)
def test_trim_transform(self):
Author.objects.create(name=' John ')
Author.objects.create(name='Rhonda')
tests = (
(LTrim, 'John '),
(RTrim, ' John'),
(Trim, 'John'),
)
for transform, trimmed_name in tests:
with self.subTest(transform=transform):
with register_lookup(CharField, transform):
authors = Author.objects.filter(**{'name__%s' % transform.lookup_name: trimmed_name})
self.assertQuerysetEqual(authors, [' John '], lambda a: a.name)
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