product_usability: make the field seller_id searcheable

product_usability/models/product_template.py

@@ -16,6 +16,7 @@ class ProductTemplate(models.Model):
     seller_id = fields.Many2one(
         'res.partner',
         compute="_compute_seller_id",
+        search="_search_seller_id",
         string='Main Supplier')
 
     # in v14, I noticed that the tracking of the fields of product.template
@@ -34,6 +35,15 @@ class ProductTemplate(models.Model):
     company_id = fields.Many2one(tracking=110)
     barcode_type = fields.Char(compute='_compute_template_barcode_type')
 
+
+    def _search_seller_id(self, operator, value):
+        # searching on the first line of a o2m is not that easy
+        # So we search all potential matching products
+        # Then we filter on the seller_id
+        records = self.search([("seller_ids.partner_id", operator, value)])
+        records = records.filtered_domain([("seller_id", operator, value)])
+        return [("id", "in", records.ids)]
+
     def _compute_seller_id(self):
         for record in self:
             record.seller_id = fields.first(record.seller_ids).name