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