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ea3beb4f5a
This prevented the default behavior of BaseExpression._resolve_output_field from error'ing out when such functions accepted both expressions from mixed types (e.g. SubStr(CharField, IntegerField, IntegerField)).
28 lines
1.2 KiB
Python
28 lines
1.2 KiB
Python
from django.db.models import IntegerField, Value
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from django.db.models.functions import Left, Lower
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from django.test import TestCase
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from ..models import Author
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class LeftTests(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=Left('name', 5))
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self.assertQuerysetEqual(authors.order_by('name'), ['John ', 'Rhond'], lambda a: a.name_part)
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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(Left('name', 2)))
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self.assertQuerysetEqual(authors.order_by('name'), ['smithj', 'rh'], lambda a: a.alias)
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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=Left('name', 0))
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def test_expressions(self):
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authors = Author.objects.annotate(name_part=Left('name', Value(3, output_field=IntegerField())))
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self.assertQuerysetEqual(authors.order_by('name'), ['Joh', 'Rho'], lambda a: a.name_part)
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