Fix floating-point issue on bills (Fix #31)
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2 changed files with 8 additions and 1 deletions
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@ -1,9 +1,12 @@
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from django.utils.translation import gettext_lazy as _
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import decimal
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# Define DecimalField properties, used to represent amounts of money.
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AMOUNT_MAX_DIGITS=10
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AMOUNT_DECIMALS=2
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decimal.getcontext().prec = AMOUNT_DECIMALS
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# http://xml.coverpages.org/country3166.html
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COUNTRIES = (
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('AD', _('Andorra')),
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@ -494,6 +494,10 @@ class BillRecord():
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else:
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self.one_time_price = 0
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# Set decimal context for amount computations.
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# XXX: understand why we need +1 here.
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decimal.getcontext().prec = AMOUNT_DECIMALS + 1
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@property
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def recurring_count(self):
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# Compute billing delta.
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@ -531,7 +535,7 @@ class BillRecord():
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(_, days_in_month) = monthrange(
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self.bill.starting_date.year,
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self.bill.starting_date.month)
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return days / days_in_month
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return round(days / days_in_month, AMOUNT_DECIMALS)
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elif self.recurring_period == RecurringPeriod.PER_WEEK:
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weeks = ceil(billed_delta / timedelta(week=1))
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return weeks
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