Django ORM Query Not Returning Expected Results with Prefetch Related
I'm learning this framework and I recently switched to Quick question that's been bugging me - I've searched everywhere and can't find a clear answer... I'm currently working on a Django application (version 3.2) and I have a situation where I'm trying to optimize some database queries using `prefetch_related`, but I'm not getting the results I expect. I have two models: `Author` and `Book`, where an author can have multiple books. Here's the relevant model code: ```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) ``` I want to retrieve all authors along with their books efficiently. So I wrote the following query: ```python from .models import Author authors = Author.objects.prefetch_related('books').all() for author in authors: print(author.name, [book.title for book in author.books.all()]) ``` However, I'm seeing that the books for some authors are returning as empty lists even though I know there are books associated with those authors in the database. For instance, I have an author named 'John Doe' who has two books, but when I print out the books, I get: ``` John Doe [] ``` I've tried checking the database directly and confirmed that the `Book` entries exist and are correctly linked to their authors by the foreign key. I also confirmed that there are no issues with the database connection. As a test, I also tried removing `prefetch_related` and directly accessing the books within the loop, which did return the expected results. However, I want to utilize `prefetch_related` for better performance. Could there be something I'm missing with how `prefetch_related` works in this scenario? Any insights or suggestions on how to fix this would be greatly appreciated! What's the best practice here? This is part of a larger API I'm building. Any help would be greatly appreciated! Could someone point me to the right documentation? The stack includes Python and several other technologies. What's the correct way to implement this? I'm working with Python in a Docker container on macOS.