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52 lines
1.8 KiB
Python
52 lines
1.8 KiB
Python
from django.db import connection
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from django.db.models import IntegerField, Value
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from django.db.models.functions import Length, Lower, Right
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from django.test import TestCase
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from ..models import Author
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class RightTests(TestCase):
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@classmethod
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def setUpTestData(cls):
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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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def test_basic(self):
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authors = Author.objects.annotate(name_part=Right("name", 5))
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self.assertQuerySetEqual(
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authors.order_by("name"), ["Smith", "honda"], lambda a: a.name_part
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)
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# If alias is null, set it to the first 2 lower characters of the name.
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Author.objects.filter(alias__isnull=True).update(alias=Lower(Right("name", 2)))
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self.assertQuerySetEqual(
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authors.order_by("name"), ["smithj", "da"], lambda a: a.alias
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)
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def test_invalid_length(self):
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with self.assertRaisesMessage(ValueError, "'length' must be greater than 0"):
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Author.objects.annotate(raises=Right("name", 0))
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def test_zero_length(self):
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Author.objects.create(name="Tom", alias="tom")
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authors = Author.objects.annotate(
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name_part=Right("name", Length("name") - Length("alias"))
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)
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self.assertQuerySetEqual(
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authors.order_by("name"),
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[
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"mith",
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"" if connection.features.interprets_empty_strings_as_nulls else None,
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"",
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],
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lambda a: a.name_part,
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)
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def test_expressions(self):
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authors = Author.objects.annotate(
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name_part=Right("name", Value(3, output_field=IntegerField()))
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)
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self.assertQuerySetEqual(
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authors.order_by("name"), ["ith", "nda"], lambda a: a.name_part
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)
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