I'm having some trouble getting F() expressions to obey my parentheses
when I don't want the default order of operations. For example, given
the model:
class MyModel(models.Model):
wins = models.DecimalField(max_digits=1, decimal_places=0)
losses = models.DecimalField(max_digits=1, decimal_places=0)
win_percentage = models.DecimalField(max_digits=4,
decimal_places=3, default=Decimal('0.000'))
I get the following results when trying to calculate the
win_percentage:
In [1]: MyModel.objects.create(wins=2, losses=4)
Out[1]: <MyModel: MyModel object>
In [2]: MyModel.objects.all().update(win_percentage=F('wins') / (F
('wins') + F('losses')))
Out[2]: 1
# I expect this to return Decimal("0.333")
In [3]: MyModel.objects.get(pk=1).win_percentage
Out[3]: Decimal("5.000")
It appears to be ignoring the parentheses around F('wins') + F
('losses'), and so instead of 2 / (2 + 4) = .333, I'm getting 2 / 2 +
4 = 5. Am I doing this wrong, or is this by design, or is it a bug?
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