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import math
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_save_nan_invalid(self):
msg = "“nan” value must be a decimal number."
for value in [float("nan"), math.nan, "nan"]:
with self.subTest(value), self.assertRaisesMessage(ValidationError, msg):
BigD.objects.create(d=value)
def test_save_inf_invalid(self):
msg = "“inf” value must be a decimal number."
for value in [float("inf"), math.inf, "inf"]:
with self.subTest(value), self.assertRaisesMessage(ValidationError, msg):
BigD.objects.create(d=value)
msg = "“-inf” value must be a decimal number."
for value in [float("-inf"), -math.inf, "-inf"]:
with self.subTest(value), self.assertRaisesMessage(ValidationError, msg):
BigD.objects.create(d=value)
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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