111 lines
4.3 KiB
Python
111 lines
4.3 KiB
Python
import math
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from decimal import Decimal
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from django.core import validators
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from django.core.exceptions import ValidationError
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from django.db import models
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from django.test import TestCase
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from .models import BigD, Foo
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class DecimalFieldTests(TestCase):
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def test_to_python(self):
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f = models.DecimalField(max_digits=4, decimal_places=2)
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self.assertEqual(f.to_python(3), Decimal('3'))
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self.assertEqual(f.to_python('3.14'), Decimal('3.14'))
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# to_python() converts floats and honors max_digits.
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self.assertEqual(f.to_python(3.1415926535897), Decimal('3.142'))
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self.assertEqual(f.to_python(2.4), Decimal('2.400'))
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# Uses default rounding of ROUND_HALF_EVEN.
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self.assertEqual(f.to_python(2.0625), Decimal('2.062'))
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self.assertEqual(f.to_python(2.1875), Decimal('2.188'))
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def test_invalid_value(self):
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field = models.DecimalField(max_digits=4, decimal_places=2)
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msg = '“%s” value must be a decimal number.'
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tests = [
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(),
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[],
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{},
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set(),
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object(),
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complex(),
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'non-numeric string',
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b'non-numeric byte-string',
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]
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for value in tests:
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with self.subTest(value):
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with self.assertRaisesMessage(ValidationError, msg % (value,)):
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field.clean(value, None)
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def test_default(self):
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f = models.DecimalField(default=Decimal('0.00'))
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self.assertEqual(f.get_default(), Decimal('0.00'))
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def test_get_prep_value(self):
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f = models.DecimalField(max_digits=5, decimal_places=1)
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self.assertIsNone(f.get_prep_value(None))
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self.assertEqual(f.get_prep_value('2.4'), Decimal('2.4'))
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def test_filter_with_strings(self):
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"""
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Should be able to filter decimal fields using strings (#8023).
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"""
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foo = Foo.objects.create(a='abc', d=Decimal('12.34'))
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self.assertEqual(list(Foo.objects.filter(d='12.34')), [foo])
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def test_save_without_float_conversion(self):
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"""
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Ensure decimals don't go through a corrupting float conversion during
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save (#5079).
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"""
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bd = BigD(d='12.9')
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bd.save()
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bd = BigD.objects.get(pk=bd.pk)
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self.assertEqual(bd.d, Decimal('12.9'))
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def test_save_nan_invalid(self):
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msg = '“nan” value must be a decimal number.'
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with self.assertRaisesMessage(ValidationError, msg):
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BigD.objects.create(d=float('nan'))
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with self.assertRaisesMessage(ValidationError, msg):
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BigD.objects.create(d=math.nan)
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def test_fetch_from_db_without_float_rounding(self):
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big_decimal = BigD.objects.create(d=Decimal('.100000000000000000000000000005'))
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big_decimal.refresh_from_db()
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self.assertEqual(big_decimal.d, Decimal('.100000000000000000000000000005'))
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def test_lookup_really_big_value(self):
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"""
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Really big values can be used in a filter statement.
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"""
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# This should not crash.
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Foo.objects.filter(d__gte=100000000000)
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def test_max_digits_validation(self):
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field = models.DecimalField(max_digits=2)
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expected_message = validators.DecimalValidator.messages['max_digits'] % {'max': 2}
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with self.assertRaisesMessage(ValidationError, expected_message):
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field.clean(100, None)
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def test_max_decimal_places_validation(self):
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field = models.DecimalField(decimal_places=1)
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expected_message = validators.DecimalValidator.messages['max_decimal_places'] % {'max': 1}
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with self.assertRaisesMessage(ValidationError, expected_message):
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field.clean(Decimal('0.99'), None)
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def test_max_whole_digits_validation(self):
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field = models.DecimalField(max_digits=3, decimal_places=1)
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expected_message = validators.DecimalValidator.messages['max_whole_digits'] % {'max': 2}
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with self.assertRaisesMessage(ValidationError, expected_message):
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field.clean(Decimal('999'), None)
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def test_roundtrip_with_trailing_zeros(self):
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"""Trailing zeros in the fractional part aren't truncated."""
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obj = Foo.objects.create(a='bar', d=Decimal('8.320'))
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obj.refresh_from_db()
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self.assertEqual(obj.d.compare_total(Decimal('8.320')), Decimal('0'))
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