Django 4.1: implementing Filtering Related Models in a Custom Manager
I'm working on a personal project and I've tried everything I can think of but I've been banging my head against this for hours... I'm working with an scenario with filtering related models using a custom manager in Django 4.1. I have a `Book` model that has a foreign key relationship with an `Author` model. My goal is to create a custom manager for `Book` to filter books by a specific author's name. However, when I try to use the custom manager, it doesn't seem to filter correctly, returning all books instead of the expected subset. Here's the relevant code for the models and the custom manager: ```python from django.db import models class Author(models.Model): name = models.CharField(max_length=100) def __str__(self): return self.name class BookManager(models.Manager): def by_author_name(self, author_name): return self.filter(author__name__iexact=author_name) class Book(models.Model): title = models.CharField(max_length=200) author = models.ForeignKey(Author, on_delete=models.CASCADE) objects = BookManager() def __str__(self): return self.title ``` I've tried using the custom manager like this in my Django shell: ```python from myapp.models import Book books_by_author = Book.objects.by_author_name('John Doe') ``` However, this returns all books instead of filtering by 'John Doe'. I also checked the database and confirmed that there are indeed books authored by 'John Doe'. I've looked over the code multiple times, but I need to seem to find the scenario. Could it be related to the way Django handles queries or foreign key lookups? Any insights on what I'm missing or how I can debug this further would be greatly appreciated! This is part of a larger application I'm building. Thanks for your help in advance! For reference, this is a production desktop app. Any feedback is welcome!