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[2.0.x] Fixed #28562 -- Fixed DecimalValidator handling of positive exponent scientific notation.

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Backport of e8c4596329 from master
This commit is contained in:
Josh Schneier
2017-09-27 09:42:04 -04:00
committed by Tim Graham
parent 5b38d7e973
commit 7c6590af5f
3 changed files with 21 additions and 13 deletions
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24
django/core/validators.py
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@@ -414,15 +414,21 @@ class DecimalValidator:
def __call__(self, value):
digit_tuple, exponent = value.as_tuple()[1:]
decimals = abs(exponent)
# digit_tuple doesn't include any leading zeros.
digits = len(digit_tuple)
if decimals > digits:
# We have leading zeros up to or past the decimal point. Count
# everything past the decimal point as a digit. We do not count
# 0 before the decimal point as a digit since that would mean
# we would not allow max_digits = decimal_places.
digits = decimals
if exponent >= 0:
# A positive exponent adds that many trailing zeros.
digits = len(digit_tuple) + exponent
decimals = 0
else:
# If the absolute value of the negative exponent is larger than the
# number of digits, then it's the same as the number of digits,
# because it'll consume all of the digits in digit_tuple and then
# add abs(exponent) - len(digit_tuple) leading zeros after the
# decimal point.
if abs(exponent) > len(digit_tuple):
digits = decimals = abs(exponent)
else:
digits = len(digit_tuple)
decimals = abs(exponent)
whole_digits = digits - decimals
if self.max_digits is not None and digits > self.max_digits:

9
tests/forms_tests/field_tests/test_decimalfield.py
View File

@@ -119,11 +119,12 @@ class DecimalFieldTest(FormFieldAssertionsMixin, SimpleTestCase):
f.clean('1.1')
def test_decimalfield_scientific(self):
f = DecimalField(max_digits=2, decimal_places=2)
self.assertEqual(f.clean('1E+2'), decimal.Decimal('1E+2'))
self.assertEqual(f.clean('1e+2'), decimal.Decimal('1E+2'))
f = DecimalField(max_digits=4, decimal_places=2)
with self.assertRaisesMessage(ValidationError, "Ensure that there are no more"):
f.clean('0.546e+2')
f.clean('1E+2')
self.assertEqual(f.clean('1E+1'), decimal.Decimal('10'))
self.assertEqual(f.clean('1E-1'), decimal.Decimal('0.1'))
self.assertEqual(f.clean('0.546e+2'), decimal.Decimal('54.6'))
def test_decimalfield_widget_attrs(self):
f = DecimalField(max_digits=6, decimal_places=2)

1
tests/validators/tests.py
View File

@@ -265,6 +265,7 @@ TEST_DATA = [
(DecimalValidator(max_digits=3, decimal_places=1), Decimal('999'), ValidationError),
(DecimalValidator(max_digits=4, decimal_places=1), Decimal('999'), None),
(DecimalValidator(max_digits=20, decimal_places=2), Decimal('742403889818000000'), None),
(DecimalValidator(20, 2), Decimal('7.42403889818E+17'), None),
(DecimalValidator(max_digits=20, decimal_places=2), Decimal('7424742403889818000000'), ValidationError),
(DecimalValidator(max_digits=5, decimal_places=2), Decimal('7304E-1'), None),
(DecimalValidator(max_digits=5, decimal_places=2), Decimal('7304E-3'), ValidationError),