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Rationalize decimal logic. Closes #3222.

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This commit is contained in:
Tom Christie 2015-08-06 09:51:00 +01:00
parent f7d44dfae0
commit 38a1b3ec6b
2 changed files with 28 additions and 16 deletions
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38
rest_framework/fields.py
View File

@ -797,6 +797,11 @@ class DecimalField(Field):
self.max_value = max_value
self.min_value = min_value
if self.max_digits is not None and self.decimal_places is not None:
self.max_whole_digits = self.max_digits - self.decimal_places
else:
self.max_whole_digits = None
super(DecimalField, self).__init__(**kwargs)
if self.max_value is not None:
@ -840,24 +845,29 @@ class DecimalField(Field):
values or to enhance it in any way you need to.
"""
sign, digittuple, exponent = value.as_tuple()
decimals = exponent * decimal.Decimal(-1) if exponent < 0 else 0
# digittuple doesn't include any leading zeros.
digits = len(digittuple)
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
whole_digits = digits - decimals
if exponent >= 0:
# 1234500.0
total_digits = len(digittuple) + exponent
whole_digits = total_digits
decimal_places = 0
elif len(digittuple) > abs(exponent):
# 123.45
total_digits = len(digittuple)
whole_digits = total_digits - abs(exponent)
decimal_places = abs(exponent)
else:
# 0.001234
total_digits = abs(exponent)
whole_digits = 0
decimal_places = total_digits
if self.max_digits is not None and digits > self.max_digits:
if self.max_digits is not None and total_digits > self.max_digits:
self.fail('max_digits', max_digits=self.max_digits)
if self.decimal_places is not None and decimals > self.decimal_places:
if self.decimal_places is not None and decimal_places > self.decimal_places:
self.fail('max_decimal_places', max_decimal_places=self.decimal_places)
if self.max_digits is not None and self.decimal_places is not None and whole_digits > (self.max_digits - self.decimal_places):
self.fail('max_whole_digits', max_whole_digits=self.max_digits - self.decimal_places)
if self.max_whole_digits is not None and whole_digits > self.max_whole_digits:
self.fail('max_whole_digits', max_whole_digits=self.max_whole_digits)
return value

6
tests/test_fields.py
View File

@ -766,15 +766,17 @@ class TestDecimalField(FieldValues):
0: Decimal('0'),
12.3: Decimal('12.3'),
0.1: Decimal('0.1'),
'2E+2': Decimal('200'),
'2E+1': Decimal('20'),
}
invalid_inputs = (
('abc', ["A valid number is required."]),
(Decimal('Nan'), ["A valid number is required."]),
(Decimal('Inf'), ["A valid number is required."]),
('12.345', ["Ensure that there are no more than 3 digits in total."]),
(200000000000.0, ["Ensure that there are no more than 3 digits in total."]),
('0.01', ["Ensure that there are no more than 1 decimal places."]),
(123, ["Ensure that there are no more than 2 digits before the decimal point."])
(123, ["Ensure that there are no more than 2 digits before the decimal point."]),
('2E+2', ["Ensure that there are no more than 2 digits before the decimal point."])
)
outputs = {
'1': '1.0',