Improve code after reviews

* performance (less queries executed)
* disable tracking in tests (faster)
* use with_user instead of sudo
* the double for loop in _compute_route_ids actually generates one more
  query as the simple one in this commit (thanks to the cache)
* extract a method
* the parent locations can be found using 'parent_of' which will use the
  parent_path under the hood (example: 1/7/8 will return locations 1, 7,
  8)

[UPD] Update stock_orderpoint_route.pot

stock_orderpoint_route/i18n/stock_orderpoint_route.pot

@@ -0,0 +1,29 @@
+# Translation of Odoo Server.
+# This file contains the translation of the following modules:
+# 	* stock_orderpoint_route
+#
+msgid ""
+msgstr ""
+"Project-Id-Version: Odoo Server 13.0\n"
+"Report-Msgid-Bugs-To: \n"
+"Last-Translator: \n"
+"Language-Team: \n"
+"MIME-Version: 1.0\n"
+"Content-Type: text/plain; charset=UTF-8\n"
+"Content-Transfer-Encoding: \n"
+"Plural-Forms: \n"
+
+#. module: stock_orderpoint_route
+#: model:ir.model.fields,field_description:stock_orderpoint_route.field_stock_warehouse_orderpoint__route_ids
+msgid "Allowed routes"
+msgstr ""
+
+#. module: stock_orderpoint_route
+#: model:ir.model,name:stock_orderpoint_route.model_stock_warehouse_orderpoint
+msgid "Minimum Inventory Rule"
+msgstr ""
+
+#. module: stock_orderpoint_route
+#: model:ir.model.fields,field_description:stock_orderpoint_route.field_stock_warehouse_orderpoint__route_id
+msgid "Route"
+msgstr ""

stock_orderpoint_route/models/stock_warehouse_orderpoint.py

@@ -20,33 +20,32 @@ class StockWarehouseOrderpoint(models.Model):
     @api.depends("product_id", "warehouse_id", "warehouse_id.route_ids", "location_id")
     def _compute_route_ids(self):
         route_obj = self.env["stock.location.route"]
-        for wh in self.mapped("warehouse_id"):
-            wh_routes = wh.route_ids
-            for record in self.filtered(lambda r: r.warehouse_id == wh):
-                routes = route_obj.browse()
-                if record.product_id:
-                    routes += record.product_id.mapped(
-                        "route_ids"
-                    ) | record.product_id.mapped("categ_id").mapped("total_route_ids")
-                if record.warehouse_id:
-                    routes |= wh_routes
-                parents = record.get_parents()
-                record.route_ids = routes.filtered(
-                    lambda route: any(
-                        p.location_id in parents
-                        for p in route.rule_ids.filtered(
-                            lambda rule: rule.action in ("pull", "pull_push")
-                        ).mapped("location_src_id")
-                    )
-                )
+        for record in self:
+            wh_routes = record.warehouse_id.route_ids
+            routes = route_obj.browse()
+            if record.product_id:
+                routes += record.product_id.mapped(
+                    "route_ids"
+                ) | record.product_id.mapped("categ_id").mapped("total_route_ids")
+            if record.warehouse_id:
+                routes |= wh_routes
+            parents = record.get_parents()
+            record.route_ids = self._get_location_routes_of_parents(routes, parents)
+
+    def _get_location_routes_of_parents(self, routes, parents):
+        return routes.filtered(
+            lambda route: any(
+                p.location_id in parents
+                for p in route.rule_ids.filtered(
+                    lambda rule: rule.action in ("pull", "pull_push")
+                ).mapped("location_src_id")
+            )
+        )
 
     def get_parents(self):
-        location = self.location_id
-        result = location
-        while location.location_id:
-            location = location.location_id
-            result |= location
-        return result
+        return self.env["stock.location"].search(
+            [("id", "parent_of", self.location_id.id)]
+        )
 
     def _prepare_procurement_values(self, product_qty, date=False, group=False):
         res = super()._prepare_procurement_values(product_qty, date=date, group=group)

stock_orderpoint_route/tests/test_stock_orderpoint_route.py

@@ -8,6 +8,7 @@ class TestStockOrderpointRoute(common.SavepointCase):
     @classmethod
     def setUpClass(cls):
         super().setUpClass()
+        cls.env = cls.env(context=dict(cls.env.context, tracking_disable=True))
 
         # common models
         cls.orderpoint_model = cls.env["stock.warehouse.orderpoint"]
@@ -99,7 +100,7 @@ class TestStockOrderpointRoute(common.SavepointCase):
     def _create_user(cls, name, group_ids, company_ids):
         return (
             cls.env["res.users"]
-            .with_context({"no_reset_password": True})
+            .with_context(no_reset_password=True)
             .create(
                 {
                     "name": name,
@@ -136,7 +137,7 @@ class TestStockOrderpointRoute(common.SavepointCase):
             "location_id": self.warehouse.lot_stock_id.id,
         }
 
-        orderpoint = self.orderpoint_model.sudo(self.stock_manager).create(vals)
+        orderpoint = self.orderpoint_model.with_user(self.stock_manager).create(vals)
         self.assertIn(self.route, orderpoint.route_ids)
         self.assertIn(self.route2, orderpoint.route_ids)
         orderpoint.route_id = self.route.id
@@ -161,7 +162,7 @@ class TestStockOrderpointRoute(common.SavepointCase):
             "location_id": self.warehouse.lot_stock_id.id,
         }
 
-        orderpoint = self.orderpoint_model.sudo(self.stock_manager).create(vals)
+        orderpoint = self.orderpoint_model.with_user(self.stock_manager).create(vals)
         self.assertIn(self.route, orderpoint.route_ids)
         self.assertIn(self.route2, orderpoint.route_ids)
         orderpoint.route_id = self.route2.id