Django: Calculate the Sum of the column values through query

Question

I have a model

class ItemPrice( models.Model ):
     price = models.DecimalField ( max_digits = 8, decimal_places=2 )
     ....

I tried thi

Answer 1

Annotate adds a field to results:

>> Order.objects.annotate(total_price=Sum('price'))
, ]>

>> orders.first().total_price
Decimal('340.00')

Aggregate returns a dict with asked result:

>> Order.objects.aggregate(total_price=Sum('price'))
{'total_price': Decimal('1260.00')}