[ADD] values tree view on product attribute

product_usability/models/product_attribute.py

@@ -0,0 +1,27 @@
+# Copyright (C) 2022 Akretion (<http://www.akretion.com>).
+# @author Kévin Roche <kevin.roche@akretion.com>
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl).
+
+from odoo import api, fields, models
+
+class ProductAttribute(models.Model):
+    _inherit = "product.attribute"
+
+    values_count = fields.Integer(compute="_compute_values_count")
+
+    @api.depends("value_ids")
+    def _compute_values_count(self):
+        for attr in self:
+            attr.values_count = len(attr.value_ids)
+
+    def show_values_ids(self):
+        return {
+            "name": "Attributes Lines",
+            "type": "ir.actions.act_window",
+            "res_id": self.id,
+            "view_mode": "tree",
+            "res_model": "product.attribute.value",
+            "view_id":self.env.ref("product_usability.product_attribute_value_view_tree").id,
+            "target": "current",
+            "domain": [("id", "in", self.value_ids.ids)],
+        }