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.