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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'))
with self.assertRaises(ValidationError):
f.to_python('abc')
def test_default(self):
f = models.DecimalField(default=Decimal('0.00'))
self.assertEqual(f.get_default(), Decimal('0.00'))
def test_format(self):
f = models.DecimalField(max_digits=5, decimal_places=1)
self.assertEqual(f._format(f.to_python(2)), '2.0')
self.assertEqual(f._format(f.to_python('2.6')), '2.6')
self.assertIsNone(f._format(None))
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_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)
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