Django REST Framework - Filtering Related Models in QuerySet with Nested Serializer Issues
I'm trying to configure I'm stuck trying to I'm working on a Django REST Framework (DRF) application where I need to filter related models in my QuerySet to include only specific fields from a nested serializer. However, I'm encountering an issue where the nested serializer doesn't return the expected filtered data. I have two models, `Author` and `Book`, where each `Book` has a foreign key relation to an `Author`. I want to serialize the `Book` instances and include only the `name` field of the related `Author`. Here are 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) ``` I created the following serializers: ```python from rest_framework import serializers class AuthorSerializer(serializers.ModelSerializer): class Meta: model = Author fields = ['name'] class BookSerializer(serializers.ModelSerializer): author = AuthorSerializer() class Meta: model = Book fields = ['title', 'author'] ``` Then, in my view, I'm trying to filter books by a specific author ID and return the serialized data: ```python from rest_framework.views import APIView from rest_framework.response import Response from .models import Book from .serializers import BookSerializer class BookListView(APIView): def get(self, request, author_id=None): books = Book.objects.filter(author_id=author_id) serializer = BookSerializer(books, many=True) return Response(serializer.data) ``` When I hit the endpoint with a specific `author_id`, I receive a response with all the book titles but the author information is just an empty object: ```json [ { "title": "Book 1", "author": {} }, { "title": "Book 2", "author": {} } ] ``` I've tried various approaches, like using `Prefetch` with `select_related`, and I've verified that the `author_id` is correct. However, I still get empty objects for the author field in the response. I'm currently using Django 3.2.5 and DRF 3.12.4. Am I missing something in the serializer or the QuerySet? How can I ensure that the author data is included in the serialized output? My development environment is Debian. What are your experiences with this?