如何在drf中使用外键保存数据和检索完整模型？

# models.py
from django.db import models

class B(models.Model):
    # B 模型

class A(models.Model):
    b = models.ForeignKey(B, on_delete=models.CASCADE)
    # 外键字段 b 引用模型 B

# serializers.py
from rest_framework import serializers
from .models import A, B

class ASerializer(serializers.ModelSerializer):
    class Meta:
        model = A
        fields = '__all__'

class BSerializer(serializers.ModelSerializer):
    class Meta:
        model = B
        fields = '__all__'

# views.py
from rest_framework import viewsets
from .serializers import ASerializer, BSerializer
from .models import A, B

class AViewSet(viewsets.ModelViewSet):
    queryset = A.objects.all()
    serializer_class = ASerializer

class BViewSet(viewsets.ModelViewSet):
    queryset = B.objects.all()
    serializer_class = BSerializer