如何在Django中使用序列化程序中的外键字段？

from django.db import models

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

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

from rest_framework import serializers
from .models import Book

class BookSerializer(serializers.ModelSerializer):
    author = serializers.PrimaryKeyRelatedField(queryset=Author.objects.all())

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

from rest_framework.response import Response
from rest_framework.views import APIView

class BookView(APIView):
    def get(self, request):
        books = Book.objects.all()
        serializer = BookSerializer(books, many=True)
        return Response(serializer.data)

    def post(self, request):
        serializer = BookSerializer(data=request.data)
        if serializer.is_valid():
            serializer.save()
            return Response(serializer.data, status=201)
        return Response(serializer.errors, status=400)