django rest framework foreign key relation giving error in serializer

# models.py
from django.db import models

class Author(models.Model):
    name = models.CharField(max_length=100)
    # Other Author fields...

class Book(models.Model):
    title = models.CharField(max_length=100)
    author = models.ForeignKey(Author, on_delete=models.CASCADE)
    # Other Book fields...

# serializers.py
from rest_framework import serializers
from .models import Author, Book

class AuthorSerializer(serializers.ModelSerializer):
    class Meta:
        model = Author
        fields = ['id', 'name']

class BookSerializer(serializers.ModelSerializer):
    author = AuthorSerializer()  # Foreign key serialization

    class Meta:
        model = Book
        fields = ['id', 'title', 'author']

This Django code demonstrates a simple scenario involving two models, Author and Book, with a foreign key relationship. The Author model represents an author's details, while the Book model represents a book with a foreign key (author) referencing the Author model.

In models.py, the Author model has a name field, and the Book model has a title field along with a foreign key field referencing the Author model using models.ForeignKey.

In serializers.py, the Django REST Framework serializers are used to convert complex data types (like querysets and model instances) into native Python data types that can be easily rendered into JSON/XML content.

• AuthorSerializer is created using the ModelSerializer class from Django REST Framework. It includes fields id and name from the Author model.
• BookSerializer includes the author field, which uses AuthorSerializer() to represent the related author in a nested structure when serializing a Book instance. This enables showing author details within the book serializer.

This setup allows for serialization of Book instances with nested author details, making it easier to represent complex relationships in the API responses.