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from django.db.models import CharField
from django.db.models.functions import Length
from django.test import TestCase
from django.test.utils import register_lookup
from ..models import Author
class LengthTests(TestCase):
def test_basic(self):
Author.objects.create(name="John Smith", alias="smithj")
Author.objects.create(name="Rhonda")
authors = Author.objects.annotate(
name_length=Length("name"),
alias_length=Length("alias"),
)
self.assertQuerySetEqual(
authors.order_by("name"),
[(10, 6), (6, None)],
lambda a: (a.name_length, a.alias_length),
)
self.assertEqual(authors.filter(alias_length__lte=Length("name")).count(), 1)
def test_ordering(self):
Author.objects.create(name="John Smith", alias="smithj")
Author.objects.create(name="John Smith", alias="smithj1")
Author.objects.create(name="Rhonda", alias="ronny")
authors = Author.objects.order_by(Length("name"), Length("alias"))
self.assertQuerySetEqual(
authors,
[
("Rhonda", "ronny"),
("John Smith", "smithj"),
("John Smith", "smithj1"),
],
lambda a: (a.name, a.alias),
)
def test_transform(self):
with register_lookup(CharField, Length):
Author.objects.create(name="John Smith", alias="smithj")
Author.objects.create(name="Rhonda")
authors = Author.objects.filter(name__length__gt=7)
self.assertQuerySetEqual(
authors.order_by("name"), ["John Smith"], lambda a: a.name
)
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