I am looking for floor wise price list automatic selection like VIP area with have different price for each product. I cant find any inbuild solution so i started working on new module development but below code is not working. 

model file :- 
class RestaurantFloor(models.Model):
    _inherit = 'restaurant.floor'
    pricelist_id = fields.Many2one('product.pricelist', string='Price List', required=True)


class RestaurantOrder(models.Model):
    _inherit = 'sale.order'
    floor_id = fields.Many2one('restaurant.floor', string='Floor')

    @api.onchange('floor_id')
    def _onchange_floor_id(self):
        if self.floor_id:
            self.pricelist_id = self.floor_id.pricelist_id

view :- 

Can someone please guide me.