如何用Django在序列化器上序列化多个模型？

from rest_framework import serializers

class BookSerializer(serializers.ModelSerializer):
    class Meta:
        model = Book
        fields = ('id', 'title', 'author')

class AuthorSerializer(serializers.ModelSerializer):
    books = BookSerializer(many=True)  # 嵌套的书籍序列化器

    class Meta:
        model = Author
        fields = ('id', 'name', 'books')

from rest_framework import serializers

class UserSerializer(serializers.ModelSerializer):
    class Meta:
        model = User
        fields = ('id', 'username', 'email')

class ProfileSerializer(serializers.ModelSerializer):
    class Meta:
        model = Profile
        fields = ('id', 'user', 'bio', 'avatar')

# 在视图中组合多个序列化器
class UserProfileView(APIView):
    def get(self, request, *args, **kwargs):
        user = User.objects.get(pk=kwargs['pk'])
        user_serializer = UserSerializer(user)
        profile_serializer = ProfileSerializer(user.profile)
        return Response({
            'user': user_serializer.data,
            'profile': profile_serializer.data
        })