Filter by sum of filtered related objects?

[Dustin Wyatt]

Given the following models:

class Transaction(models.Model):

  amount = models.IntegerField()

  date = models.DateField()

  terms = models.ForeignKey('Terms')

class Terms(models.Model):

  name = models.CharField(max_length=100)

  timezone = models.CharField(max_length=50)

I need to annotate Terms with the sum of the related Transaction.amount's where the Transaction.date is between two dates and what those two dates are varies by Terms.timezone.

Possible?

[Todor Velichkov]

Maybe something like this should work:

Terms.objects.annotate(
    transactions_sum=models.Subquery(
        Transaction.objects.filter(
            terms=models.OuterRef("pk"),
        )
        # Now In order to filter by some date_range
        # which vary by timezone, you would want to
        # annotate the date field with the applied timezone
        # something like
        # .annotate(tz_date=Func('date', Value('GMT'), models.OuterRef("timezone"), function='CONVERT_TZ'))
        # .filter(tz_date__range=(min_date, max_date))
        .values('terms')
        .annotate(amount_sum=models.Sum("amount"))
        .values('amount_sum'),
        output_field=models.IntegerField(),
    )
)

[Aakash Choudhary]

Yes it is possible 

Lent Asia technologies pvt Ltd,

Aakash chaudhary

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