Hello i'm making a wizard to add multiples allergens to multiples products.

I'm using odoo 17.

The wizard opens, the products selected before the wizard appear are automatically selected BUT when i want to apply one or more allergen to one or more product i have an error stating that my function inside my wizard takes only 1 argument, which is true, but got 2 arguments and i dont know why. If someone can help me it would be wonderful !

here is my wizard codes :

​Python :

from odoo import models, fields, api

class ProductAllergenWizard(models.TransientModel):

    _name = 'product.allergen.wizard'

    product_ids = fields.Many2many(

        comodel_name='product.template',

        string='Products',

        inverse_name = "allergen_category_ids"

    )

    allergen_ids = fields.Many2many(

        string = "Allergen Category",

        comodel_name="allergen_category.category",

        inverse_name="products_ids",

    )

    @api.model

    def default_get(self, fields):

        defaults = super(ProductAllergenWizard, self).default_get(fields)

        product_ids = self._context.get('default_product_ids')

        if product_ids:

            defaults['product_ids'] = product_ids

        return defaults

    @api.model

    def add_product_allergen(self):

        for record in self:

            if record.product_ids and record.allergen_ids:

                for product in record.product_ids:

                    for allergen in record.allergen_ids:

                        product.allergen_ids += allergen

​xml :

        product.wizard.form

        product.allergen.wizard

        product.wizard.form

        product.allergen.wizard

        form

        new

And here is the error if it can help to solve the problem :

TypeError: ProductAllergenWizard.add_product_allergen() takes 1 positional argument but 2 were given