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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 .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):
try:
CharField.register_lookup(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])
finally:
CharField._unregister_lookup(Ord)
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