49 lines
1.7 KiB
Python
49 lines
1.7 KiB
Python
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from django.db.models import CharField
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from django.db.models.functions import Length
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from django.test import TestCase
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from ..models import Author
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class LengthTests(TestCase):
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def test_basic(self):
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Author.objects.create(name='John Smith', alias='smithj')
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Author.objects.create(name='Rhonda')
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authors = Author.objects.annotate(
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name_length=Length('name'),
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alias_length=Length('alias'),
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)
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self.assertQuerysetEqual(
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authors.order_by('name'), [(10, 6), (6, None)],
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lambda a: (a.name_length, a.alias_length)
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)
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self.assertEqual(authors.filter(alias_length__lte=Length('name')).count(), 1)
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def test_ordering(self):
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Author.objects.create(name='John Smith', alias='smithj')
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Author.objects.create(name='John Smith', alias='smithj1')
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Author.objects.create(name='Rhonda', alias='ronny')
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authors = Author.objects.order_by(Length('name'), Length('alias'))
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self.assertQuerysetEqual(
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authors, [
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('Rhonda', 'ronny'),
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('John Smith', 'smithj'),
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('John Smith', 'smithj1'),
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],
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lambda a: (a.name, a.alias)
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)
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def test_transform(self):
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try:
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CharField.register_lookup(Length)
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Author.objects.create(name='John Smith', alias='smithj')
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Author.objects.create(name='Rhonda')
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authors = Author.objects.filter(name__length__gt=7)
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self.assertQuerysetEqual(
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authors.order_by('name'), ['John Smith'],
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lambda a: a.name
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)
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finally:
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CharField._unregister_lookup(Length)
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