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from django.db.models import CharField, Value
from django.db.models.functions import Left, Ord
from django.test import TestCase
from django.test.utils import register_lookup
from ..models import Author
class OrdTests(TestCase):
@classmethod
def setUpTestData(cls):
cls.john = Author.objects.create(name="John Smith", alias="smithj")
cls.elena = Author.objects.create(name="Élena Jordan", alias="elena")
cls.rhonda = Author.objects.create(name="Rhonda")
def test_basic(self):
authors = Author.objects.annotate(name_part=Ord("name"))
self.assertCountEqual(
authors.filter(name_part__gt=Ord(Value("John"))), [self.elena, self.rhonda]
)
self.assertCountEqual(
authors.exclude(name_part__gt=Ord(Value("John"))), [self.john]
)
def test_transform(self):
with register_lookup(CharField, Ord):
authors = Author.objects.annotate(first_initial=Left("name", 1))
self.assertCountEqual(
authors.filter(first_initial__ord=ord("J")), [self.john]
)
self.assertCountEqual(
authors.exclude(first_initial__ord=ord("J")), [self.elena, self.rhonda]
)
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