Django 4.2: Custom QuerySet Method Not Filtering Correctly with Annotate and Values
I'm having a hard time understanding I'm working with an scenario with a custom QuerySet method in my Django 4.2 application, where I'm trying to filter results based on an annotated field but it's not yielding the expected results. I have a model called `Product` with fields `name`, `price`, and `category`. I created a custom QuerySet method to filter products by categories and calculate the average price of the products in those categories. Here’s the code for my model and the QuerySet: ```python from django.db import models from django.db.models import Avg class ProductQuerySet(models.QuerySet): def filter_by_category_with_avg_price(self, category): return self.filter(category=category).annotate(avg_price=Avg('price')).values('name', 'avg_price') class Product(models.Model): name = models.CharField(max_length=100) price = models.DecimalField(max_digits=10, decimal_places=2) category = models.CharField(max_length=50) objects = ProductQuerySet.as_manager() ``` When I call this method like so: ```python products_with_avg = Product.objects.filter_by_category_with_avg_price('Electronics') ``` I expect to get a list of products in the 'Electronics' category along with their average price. However, I'm getting an empty queryset: `QuerySet []`. I checked that there are indeed products in the database that match this category, but I need to seem to retrieve them. I've also verified that the data exists: ```python Product.objects.filter(category='Electronics').exists() # Returns True ``` Additionally, I tried simplifying the query to just filter without annotation: ```python products = Product.objects.filter(category='Electronics') ``` This returns the expected products, so the scenario seems to stem from the annotation part. I've confirmed that there are products with prices, and I even attempted to remove the `annotate()` method to see if it changes the outcome, but to no avail. I suspect it might be related to how I'm using `annotate` and `values`, but I'm not sure what the exact question is. Can someone point out what I might be missing here? I'm working in a CentOS environment. Am I missing something obvious?