[IMP]base_user_role: Groups-roles navigation

base_user_role/models/group.py

@@ -0,0 +1,82 @@
+from odoo import api, fields, models
+
+
+class ResGroups(models.Model):
+    _inherit = "res.groups"
+
+    # The inverse field of the field group_id on the res.users.role model
+    # This field should be used a One2one relation as a role can only be
+    # represented by one group. It's declared as a One2many field as the
+    # inverse field on the res.users.role it's declared as a Many2one
+    role_id = fields.One2many(
+        comodel_name="res.users.role",
+        inverse_name="group_id",
+        help="Relation for the groups that represents a role",
+    )
+
+    role_ids = fields.Many2many(
+        comodel_name="res.users.role",
+        relation="res_groups_implied_roles_rel",
+        string="Roles",
+        compute="_compute_role_ids",
+        help="Roles in which the group is involved",
+    )
+
+    parent_ids = fields.Many2many(
+        "res.groups",
+        "res_groups_implied_rel",
+        "hid",
+        "gid",
+        string="Parents",
+        help="Inverse relation for the Inherits field. "
+        "The groups from which this group is inheriting",
+    )
+
+    trans_parent_ids = fields.Many2many(
+        comodel_name="res.groups",
+        string="Parent Groups",
+        compute="_compute_trans_parent_ids",
+    )
+
+    role_count = fields.Integer("# Roles", compute="_compute_role_count")
+
+    def _compute_role_count(self):
+        for group in self:
+            group.role_count = len(group.role_ids)
+
+    @api.depends("parent_ids.trans_parent_ids")
+    def _compute_trans_parent_ids(self):
+        for group in self:
+            group.trans_parent_ids = (
+                group.parent_ids | group.parent_ids.trans_parent_ids
+            )
+
+    def _compute_role_ids(self):
+        for group in self:
+            if group.trans_parent_ids:
+                group.role_ids = group.trans_parent_ids.role_id
+            else:
+                group.role_ids = group.role_id
+
+    def action_view_roles(self):
+        self.ensure_one()
+        action = self.env["ir.actions.act_window"]._for_xml_id(
+            "base_user_role.action_res_users_role_tree"
+        )
+        action["context"] = {}
+        if len(self.role_ids) > 1:
+            action["domain"] = [("id", "in", self.role_ids.ids)]
+        elif self.role_ids:
+            form_view = [
+                (self.env.ref("base_user_role.view_res_users_role_form").id, "form")
+            ]
+            if "views" in action:
+                action["views"] = form_view + [
+                    (state, view) for state, view in action["views"] if view != "form"
+                ]
+            else:
+                action["views"] = form_view
+            action["res_id"] = self.role_ids.id
+        else:
+            action = {"type": "ir.actions.act_window_close"}
+        return action