Django 4.1: implementing Custom QuerySet Filtering on Related Models
I'm trying to figure out I'm sure I'm missing something obvious here, but I'm working with an scenario with filtering a custom QuerySet in Django 4.1. I have two models, `Author` and `Book`, where `Book` has a foreign key relationship with `Author`. I want to filter all books written by authors from a specific city. My current approach looks like this: ```python from django.db import models class Author(models.Model): name = models.CharField(max_length=100) city = models.CharField(max_length=100) class Book(models.Model): title = models.CharField(max_length=100) author = models.ForeignKey(Author, on_delete=models.CASCADE) # Custom QuerySet method class BookQuerySet(models.QuerySet): def by_author_city(self, city): return self.filter(author__city=city) # Usage in views books = Book.objects.by_author_city('New York') ``` However, when I try to execute this code, I receive the following behavior: ``` AttributeError: 'BookQuerySet' object has no attribute 'filter' ``` I have overridden the `QuerySet` methods and registered it in my manager like this: ```python class BookManager(models.Manager): def get_queryset(self): return BookQuerySet(self.model, using=self._db) class Book(models.Model): title = models.CharField(max_length=100) author = models.ForeignKey(Author, on_delete=models.CASCADE) objects = BookManager() ``` I thought this was correct, but it seems like the `filter` method is not recognized. I've also attempted to call `list(books)` to force evaluation, but the behavior continues. What am I missing here? This is part of a larger CLI tool I'm building. For reference, this is a production desktop app. Thanks, I really appreciate it!