wagtail-longclaw/longclaw/longclawbasket/serializers.py

from rest_framework import serializers

from longclaw.longclawproducts.serializers import ProductVariantSerializer
from longclaw.longclawbasket.models import BasketItem

class BasketItemSerializer(serializers.ModelSerializer):

    variant = ProductVariantSerializer()
    price = serializers.SerializerMethodField()
    total = serializers.SerializerMethodField()

    class Meta:
        model = BasketItem
        fields = "__all__"

    def get_price(self, obj):
        return obj.price()

    def get_total(self, obj):
        return obj.total()