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fix: InvoiceQuerySet.annotate_total()

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imperosol
2024-10-12 14:58:23 +02:00
parent 1c774aa4a0
commit 7312580a8d
2 changed files with 24 additions and 2 deletions
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7
eboutic/models.py
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@ -167,10 +167,15 @@ class InvoiceQueryset(models.QuerySet):
The total amount is the sum of (product_unit_price * quantity)
for all items related to the invoice.
"""
# aggregates within subqueries require a little bit of black magic,
# but hopefully, django gives a comprehensive documentation for that :
# https://docs.djangoproject.com/en/stable/ref/models/expressions/#using-aggregates-within-a-subquery-expression
return self.annotate(
total=Subquery(
InvoiceItem.objects.filter(invoice_id=OuterRef("pk"))
.annotate(total=Sum(F("product_unit_price") * F("quantity")))
.annotate(item_amount=F("product_unit_price") * F("quantity"))
.values("item_amount")
.annotate(total=Sum("item_amount"))
.values("total")
)
)