not able to use CustomColumn on extra_columns

[miyou995]

my case is simple i have a Product PaymentType and Price

i want my table to have as columns name, PT1, PT2, PT3 ...etc
and match the values so on PT1 i get the PaymentType id pass it to my model method

    def get_price_for_payment_type(self, payment_type_id):
        price = self.prices.get(payment_type_id=payment_type_id)
        return price.amount

and get the price, but it doesn't work like this

the custom Column

class PriceColumn(tables.Column):
    def __init__(self, payment_type_id, *args, **kwargs):
        self.payment_type_id = payment_type_id
        super(PriceColumn, self).__init__(*args, **kwargs)

    def render(self, record):
        return record.get_price_for_payment_type(self.payment_type_id)
    

the Table

class ProductHTMxTable(tables.Table):
    def __init__(self, data, *args, **kwargs):
        payment_types = PaymentType.objects.filter(is_active=True).order_by('order')

        extra_columns = []
        for payment_type in payment_types:
            column_name = f'price_{payment_type.id}'
            
            column = PriceColumn(
                payment_type_id=payment_type.id,
                verbose_name=payment_type.name,
            )

            extra_columns.append((column_name, column))

        super().__init__(data, extra_columns=extra_columns, *args, **kwargs)

i found a working solution but i still want to use a simple method like this .
the working solution create a model method that return a dict

     def get_price_dict(self):
        return {price.payment_type.id: price.amount for price in self.prices.all()}

and traverse it like this... full init method

class ProductHTMxTable(tables.Table):
    def __init__(self, data, *args, **kwargs):
        payment_types = PaymentType.objects.filter(is_active=True).order_by('order')

        extra_columns = []
        for payment_type in payment_types:
            column_name = f'price_{payment_type.id}'
            accessor_str = f'get_price_dict.{payment_type.id}' 

            column = tables.Column(
                verbose_name=payment_type.name,
                accessor=accessor_str,
                orderable=False,
                default='-'
            )
            extra_columns.append((column_name, column))

        super().__init__(data, extra_columns=extra_columns, *args, **kwargs)

i really want to know why the custom Column doesn't work
there is no error just the render method is not being called as i added a print on it and got nothing