如何在Django序列化程序中使用ManyToManyField？

from django.db import models

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

class Product(models.Model):
    name = models.CharField(max_length=100)
    categories = models.ManyToManyField(Category)

from rest_framework import serializers
from .models import Product

class ProductSerializer(serializers.ModelSerializer):
    categories = serializers.SerializerMethodField()

    def get_categories(self, obj):
        return [category.name for category in obj.categories.all()]

    class Meta:
        model = Product
        fields = ['name', 'categories']

from rest_framework.response import Response
from rest_framework.decorators import api_view
from .models import Product
from .serializers import ProductSerializer

@api_view(['GET'])
def product_detail(request, pk):
    product = Product.objects.get(pk=pk)
    serializer = ProductSerializer(product)
    return Response(serializer.data)