无法从控制器调用序列化模型自定义函数

from rest_framework import serializers
from .models import YourModel

class YourModelSerializer(serializers.ModelSerializer):
    custom_function = serializers.SerializerMethodField()

    class Meta:
        model = YourModel
        fields = '__all__'

    def get_custom_function(self, obj):
        # 自定义逻辑
        return obj.some_attribute + 10

from rest_framework.views import APIView
from rest_framework.response import Response
from .models import YourModel
from .serializers import YourModelSerializer

class YourModelView(APIView):
    def get(self, request, format=None):
        your_model = YourModel.objects.all()
        serializer = YourModelSerializer(your_model, many=True)
        return Response(serializer.data)

# models.py
from django.db import models

class Product(models.Model):
    name = models.CharField(max_length=100)
    price = models.DecimalField(max_digits=10, decimal_places=2)
    discount = models.DecimalField(max_digits=5, decimal_places=2)

    def get_discounted_price(self):
        return self.price * (1 - self.discount / 100)

# serializers.py
from rest_framework import serializers
from .models import Product

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

    class Meta:
        model = Product
        fields = '__all__'

    def get_discounted_price(self, obj):
        return obj.get_discounted_price()

# views.py
from rest_framework.views import APIView
from rest_framework.response import Response
from .models import Product
from .serializers import ProductSerializer

class ProductDetailView(APIView):
    def get(self, request, pk, format=None):
        product = Product.objects.get(pk=pk)
        serializer = ProductSerializer(product)
        return Response(serializer.data)