class paymentInvoiceSerializer(serializers.ModelSerializer):
    invoiceOwner = purchaserSerializer(many=False)
    class Meta:
        model = paymentInvoice
        fields = '__all__'


    def create(self, validated_data):
        purchaser = Purchaser.objects.create(name=validated_data.pop("invoiceOwner"))
        validated_data.update({"invoiceOwner": purchaser})

        return paymentInvoice.objects.create(**validated_data)