#24385: Problem with aggregate(Sum())
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Reporter: mcagl | Owner: nobody
Type: Uncategorized | Status: new
Component: Database layer (models, ORM) | Version: 1.6
Severity: Normal | Keywords:
Triage Stage: Unreviewed | Has patch: 0
Easy pickings: 0 | UI/UX: 0
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Hello,
I setup a minimal project here:
https://github.com/mcagl/minimal_django_sum_test to demonstrate the
problem.
I'm working with Django 1.6.x and I noticed something that I don't
understand.
As you can see from the github repository, I have a Tag model and a Row
model with a m2m towards Tag and a DecimalField called amount.
If I filter Row objects for more than one Tag, and there is/are Row
objects that have more than one Tag among the one filtered by,
Sum('amount') counts it/them once per Tag, even if I use distinct().
Please note also that I assert, in the test, that the filtered queryset is
composed by three Row objects, as expected, but the next assert fails,
with 40 != 30.
I added a test that instead of aggregate(Sum('amount')) does sum([x.amount
for x in rows]) which passes.
Is this a bug in Sum() or am I missing something?
Kind regards,
Mark
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Ticket URL: <https://code.djangoproject.com/ticket/24385>
Django <https://code.djangoproject.com/>
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