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from django.db.models import F, IntegerField
from django.db.models.functions import Chr, Left, Ord
from django.test import TestCase
from django.test.utils import register_lookup
from ..models import Author
class ChrTests(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(first_initial=Left("name", 1))
self.assertCountEqual(authors.filter(first_initial=Chr(ord("J"))), [self.john])
self.assertCountEqual(
authors.exclude(first_initial=Chr(ord("J"))), [self.elena, self.rhonda]
)
def test_non_ascii(self):
authors = Author.objects.annotate(first_initial=Left("name", 1))
self.assertCountEqual(authors.filter(first_initial=Chr(ord("É"))), [self.elena])
self.assertCountEqual(
authors.exclude(first_initial=Chr(ord("É"))), [self.john, self.rhonda]
)
def test_transform(self):
with register_lookup(IntegerField, Chr):
authors = Author.objects.annotate(name_code_point=Ord("name"))
self.assertCountEqual(
authors.filter(name_code_point__chr=Chr(ord("J"))), [self.john]
)
self.assertCountEqual(
authors.exclude(name_code_point__chr=Chr(ord("J"))),
[self.elena, self.rhonda],
)
def test_annotate(self):
authors = Author.objects.annotate(
first_initial=Left("name", 1),
initial_chr=Chr(ord("J")),
)
self.assertSequenceEqual(
authors.filter(first_initial=F("initial_chr")),
[self.john],
)
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