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