Django 4.1: implementing Conditional Aggregation on Annotated QuerySet Leading to Unexpected Results
Does anyone know how to I'm stuck on something that should probably be simple. I recently switched to I'm sure I'm missing something obvious here, but I've been banging my head against this for hours. I'm experiencing unexpected behavior when using conditional aggregation on an annotated Django QuerySet. I have a model named `Order` with fields `status` (a CharField with choices) and `amount` (a DecimalField). I want to calculate the total amount of orders grouped by their status, but it seems that my `annotate` call isn't returning the expected results. Here's the code that I have: ```python from django.db.models import Sum, Case, When, IntegerField # Assuming 'Order' model with fields 'status' and 'amount' order_totals = Order.objects.values('status').annotate( total_amount=Sum(Case( When(status='completed', then='amount'), When(status='pending', then='amount'), output_field=IntegerField(), )) ) ``` When I run this, I'm getting totals, but they are not reflecting the amounts correctly based on the status. For example, if I have 3 completed orders totaling $300 and 2 pending orders totaling $150, the result shows the total as $150 for both statuses. I have tried changing the `Case` conditions, checking if the `amount` field is being aggregated correctly, and even simplified the query to just include one status condition, but the results remain incorrect. I also verified the database entries to ensure there are no issues with the data itself. The SQL generated by the ORM seems fine as it is producing the expected `SUM` structure, but the values don't match what I see directly in the database. I am using Django 4.1 with PostgreSQL as my backend. Has anyone faced a similar scenario or can suggest what might be going wrong here? I'm working on a service that needs to handle this. I'd really appreciate any guidance on this. Any suggestions would be helpful. This is part of a larger service I'm building. I'm working with Python in a Docker container on Windows 11. Any ideas how to fix this?