28 lines
1.1 KiB
Python
28 lines
1.1 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 .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(authors.filter(name_part__gt=Ord(Value('John'))), [self.elena, self.rhonda])
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self.assertCountEqual(authors.exclude(name_part__gt=Ord(Value('John'))), [self.john])
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def test_transform(self):
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try:
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CharField.register_lookup(Ord)
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authors = Author.objects.annotate(first_initial=Left('name', 1))
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self.assertCountEqual(authors.filter(first_initial__ord=ord('J')), [self.john])
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self.assertCountEqual(authors.exclude(first_initial__ord=ord('J')), [self.elena, self.rhonda])
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finally:
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CharField._unregister_lookup(Ord)
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