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