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from django.db.models import CharField
from django.db.models.functions import Lower
from django.test import TestCase
from django.test.utils import register_lookup
from ..models import Author
class LowerTests(TestCase):
def test_basic(self):
Author.objects.create(name="John Smith", alias="smithj")
Author.objects.create(name="Rhonda")
authors = Author.objects.annotate(lower_name=Lower("name"))
self.assertQuerySetEqual(
authors.order_by("name"), ["john smith", "rhonda"], lambda a: a.lower_name
)
Author.objects.update(name=Lower("name"))
self.assertQuerySetEqual(
authors.order_by("name"),
[
("john smith", "john smith"),
("rhonda", "rhonda"),
],
lambda a: (a.lower_name, a.name),
)
def test_num_args(self):
with self.assertRaisesMessage(
TypeError, "'Lower' takes exactly 1 argument (2 given)"
):
Author.objects.update(name=Lower("name", "name"))
def test_transform(self):
with register_lookup(CharField, Lower):
Author.objects.create(name="John Smith", alias="smithj")
Author.objects.create(name="Rhonda")
authors = Author.objects.filter(name__lower__exact="john smith")
self.assertQuerySetEqual(
authors.order_by("name"), ["John Smith"], lambda a: a.name
)
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