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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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