import json from odoo import models, fields, api class ProductTemplate(models.Model): _inherit = 'product.template' # technical field used in POS frontend supplier_barcode_json = fields.Char( "Supplier barcode list", readonly=True, compute="_compute_supplier_barcode_json") @api.multi def _compute_supplier_barcode_json(self): for t in self: supplier_barcode_json = [x for x in t.mapped('seller_ids.barcode') if x] t.supplier_barcode_json = json.dumps(supplier_barcode_json)