Django Rest -获取M2M关系中的相关数据

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)
    authors = models.ManyToManyField(Author)

from rest_framework import serializers

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

class BookSerializer(serializers.ModelSerializer):
    authors = AuthorSerializer(many=True)

    class Meta:
        model = Book
        fields = ('id', 'title', 'authors')

from rest_framework import viewsets

class BookViewSet(viewsets.ModelViewSet):
    queryset = Book.objects.all()
    serializer_class = BookSerializer

from django.urls import include, path
from rest_framework import routers

router = routers.DefaultRouter()
router.register(r'books', BookViewSet)

urlpatterns = [
    path('api/', include(router.urls)),
]