从Int到Float的Django Sum聚合

Question

所以我以美分保存我的费用，但希望以欧元显示。转换问题是它首先将整数除以100，然后转换为float。它应该是相反的方式。我怎样才能做到这一点？

以下代码应说明我的问题：

>>> from django.db.models import F, FloatField, Sum
>>> from payment.models import Payment
>>> 
>>> paymentlist = Payment.objects.all()
>>> result = paymentlist.annotate(
...     fees_in_cents=Sum(F('fees'), output_field=FloatField())).annotate(
...         fees_in_euro=Sum(F('fees')/100, output_field=FloatField()))
>>> 
>>> print(result[0].fees_in_cents, result[0].fees_in_euro)
120.0 1.0

fee_in_euro显然应该是1.20

Answer 1

将费用价值除以100.0

例：

result = paymentlist.annotate(
    fees_in_cents=Sum(F('fees'), output_field=FloatField())).annotate(
    fees_in_euro=Sum(F('fees') / 100.0, output_field=FloatField())
)