如何使用外键选择要在DRF中显示的字段

# models.py
from django.db import models

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

class B(models.Model):
    a = models.ForeignKey(A, on_delete=models.CASCADE)
    field1 = models.CharField(max_length=100)
    field2 = models.CharField(max_length=100)

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

class BSerializer(serializers.ModelSerializer):
    a = serializers.PrimaryKeyRelatedField(queryset=A.objects.all())
    # 或者使用以下字段来显示关联模型的特定字段
    # a = serializers.SlugRelatedField(slug_field='name', queryset=A.objects.all())
    # a = serializers.HyperlinkedRelatedField(view_name='a-detail', read_only=True)

    class Meta:
        model = B
        fields = ['a', 'field1', 'field2']

# views.py
from rest_framework import generics
from .models import B
from .serializers import BSerializer

class BList(generics.ListCreateAPIView):
    queryset = B.objects.all()
    serializer_class = BSerializer