django sum get 0 if none
To get the sum of a field in Django and return 0 if there are no records, you can use the aggregate()
function along with the Coalesce()
function. Here are the steps to achieve this:
Step 1: Import the necessary modules and models:
from django.db.models import Sum
from django.db.models.functions import Coalesce
from .models import YourModel
Make sure to replace YourModel
with the actual name of your model.
Step 2: Define a variable to hold the sum:
total_sum = YourModel.objects.aggregate(sum_value=Coalesce(Sum('your_field'), 0))['sum_value']
Replace YourModel
with the actual name of your model, and your_field
with the actual name of the field you want to calculate the sum for.
Step 3: Access the sum value:
print(total_sum)
Now you can use the total_sum
variable to access the sum value. If there are no records, it will return 0.
That's it! These steps will allow you to calculate the sum of a field in Django and return 0 if there are no records.