48 lines
1.9 KiB
Python
48 lines
1.9 KiB
Python
from django.db import models
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from django.db.models.expressions import Value
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from django.db.models.functions import Cast
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from django.test import TestCase, ignore_warnings, skipUnlessDBFeature
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from .models import Author
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class CastTests(TestCase):
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@classmethod
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def setUpTestData(self):
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Author.objects.create(name='Bob', age=1, alias='1')
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def test_cast_from_value(self):
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numbers = Author.objects.annotate(cast_integer=Cast(Value('0'), models.IntegerField()))
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self.assertEqual(numbers.get().cast_integer, 0)
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def test_cast_from_field(self):
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numbers = Author.objects.annotate(cast_string=Cast('age', models.CharField(max_length=255)),)
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self.assertEqual(numbers.get().cast_string, '1')
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def test_cast_to_char_field_without_max_length(self):
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numbers = Author.objects.annotate(cast_string=Cast('age', models.CharField()))
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self.assertEqual(numbers.get().cast_string, '1')
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# Silence "Truncated incorrect CHAR(1) value: 'Bob'".
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@ignore_warnings(module='django.db.backends.mysql.base')
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@skipUnlessDBFeature('supports_cast_with_precision')
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def test_cast_to_char_field_with_max_length(self):
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names = Author.objects.annotate(cast_string=Cast('name', models.CharField(max_length=1)))
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self.assertEqual(names.get().cast_string, 'B')
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def test_cast_to_integer(self):
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for field_class in (
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models.IntegerField,
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models.BigIntegerField,
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models.SmallIntegerField,
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models.PositiveIntegerField,
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models.PositiveSmallIntegerField,
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):
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with self.subTest(field_class=field_class):
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numbers = Author.objects.annotate(cast_int=Cast('alias', field_class()))
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self.assertEqual(numbers.get().cast_int, 1)
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def test_cast_from_python(self):
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numbers = Author.objects.annotate(cast_float=Cast(0, models.FloatField()))
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self.assertEqual(numbers.get().cast_float, 0.0)
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