Django 4.1 QuerySet not returning expected results when using Prefetch with filters
I'm trying to figure out I'm learning this framework and Quick question that's been bugging me - I'm sure I'm missing something obvious here, but I am experiencing unexpected behavior when trying to use Django's Prefetch feature with a filtered QuerySet... I have two models: `Author` and `Book`, where an author can write multiple books. I'm trying to prefetch the books written by an author with a specific filter, but the results aren't what I expect. Here's a simplified version of my models: ```python class Author(models.Model): name = models.CharField(max_length=100) class Book(models.Model): title = models.CharField(max_length=200) author = models.ForeignKey(Author, related_name='books', on_delete=models.CASCADE) published_date = models.DateField() ``` I'm trying to fetch all authors along with their books that were published after January 1, 2020. My query looks like this: ```python from django.db.models import Prefetch from .models import Author, Book filtered_books = Book.objects.filter(published_date__gt='2020-01-01') authors = Author.objects.prefetch_related(Prefetch('books', queryset=filtered_books)).all() ``` However, when I iterate over the `authors` and print out the books for each author, it seems that I'm getting all books regardless of the filter: ```python for author in authors: print(author.name) for book in author.books.all(): # This seems to return all books, not just the filtered ones print(book.title) ``` I've also checked the SQL queries being generated and it seems like the Prefetch is not applying the filter correctly. I expected only the books published after the specified date to be returned. I tried changing the Prefetch parameter and even used `annotate` to see if that would affect the result, but it didn’t help. Is there something I'm missing here? How can I correctly implement the Prefetch so that it only includes books that match the filter? I'm using Django version 4.1. Thanks for any help! The project is a desktop app built with Python. Any pointers in the right direction?