sarlink-portal-api/billing/serializers.py

from rest_framework import serializers
from .models import Payment, Topup
from devices.serializers import DeviceSerializer


class PaymentSerializer(serializers.ModelSerializer):
    devices = DeviceSerializer(many=True, read_only=True)
    is_expired = serializers.SerializerMethodField()

    def get_is_expired(self, obj):
        return obj.is_expired

    class Meta:  # type: ignore
        model = Payment
        fields = "__all__"


class UpdatePaymentSerializer(serializers.ModelSerializer):
    class Meta:  # type: ignore
        model = Payment
        fields = [
            "number_of_months",
        ]


class TopupSerializer(serializers.ModelSerializer):
    user = serializers.SerializerMethodField()
    is_expired = serializers.SerializerMethodField()

    def get_user(self, obj):
        user = obj.user
        if user:
            return {
                "id": user.id,
                "name": user.first_name + " " + user.last_name,
                "id_card": user.id_card,
                "mobile": user.mobile,
            }
        return None

    def get_is_expired(self, obj):
        return obj.is_expired

    class Meta:  # type: ignore
        model = Topup
        fields = [
            "id",
            "amount",
            "user",
            "paid",
            "paid_at",
            "status",
            "mib_reference",
            "is_expired",
            "expires_at",
            "created_at",
            "updated_at",
        ]
        read_only_fields = ["id", "created_at", "updated_at"]