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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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