When I super a function def pricelist_change() i got this error.

Error: 'ProductConfiguratorController (extended by Website' object has no attribute 'selectable' in odoo

Controller.py

from odoo import fields, http, tools
from odoo.http import request

from odoo.addons.website_sale.controllers.main import WebsiteSale

class WebsiteSaleInherit(WebsiteSale):
    @http.route(['/shop/change_pricelist/<model("product.pricelist"):pl_id>'], type='http', auth="public", website=True,
                sitemap=False)

 def pricelist_change(self, pl_id, qcontext=None, **post):
       
        res = super(WebsiteSaleInherit, self).pricelist_change(self, **post)
        if (pl_id.selectable or pl_id == request.env.user.partner_id.property_product_pricelist) \
                and request.website.is_pricelist_available(pl_id.id):
            request.session['website_sale_current_pl'] = pl_id.id
            request.website.sale_get_order(force_pricelist=pl_id.id)            
            sample = request.env['product.pricelist.item'].sudo().search([])
            print(sample)
           
            self.qcontext.update({
                'order': sample,               
            })

            return {
                       'type': 'ir.actions.act_url',
                       'url': '/shop%s' % qcontext,
                       'target': 'self',
                   }, res

When i print pl_id of this function and main.py(source function) i got following result.

pl_id in super function: product.pricelist(1,)

pl_id in main function: <odoo.http.ProductConfiguratorController (extended by WebsiteSaleInherit, WebsiteSale) object at 0x7fccf05ff6a0>