🐛 [BUG] Handle PGRouting fields to reset (refs #4070)

geotrek/core/path_router.py

@@ -10,8 +10,20 @@
 
 class PathRouter:
     def __init__(self):
+        self.set_pgrouting_fields_to_null()
         self.set_path_network_topology()
 
+    def set_pgrouting_fields_to_null(self):
+        with connection.cursor() as cursor:
+            cursor.execute("""
+                UPDATE core_path 
+                SET source = NULL, target = NULL 
+                WHERE id IN (SELECT path_id FROM pgrouting_paths_to_set_to_null)
+            """)
+            cursor.execute("""
+                TRUNCATE pgrouting_paths_to_set_to_null
+            """)
+
     def set_path_network_topology(self):
         """ Builds or updates the paths graph (pgRouting network topology) """
         cursor = connection.cursor()

geotrek/core/templates/core/sql/post_40_paths.sql

@@ -167,7 +167,7 @@ FOR EACH ROW EXECUTE PROCEDURE path_latest_updated_d();
 CREATE FUNCTION {{ schema_geotrek }}.set_pgrouting_values_to_null() RETURNS trigger SECURITY DEFINER AS $$
 DECLARE
 BEGIN
-    UPDATE core_path SET source = NULL, target = NULL WHERE id = NEW.id;
+    INSERT INTO pgrouting_paths_to_set_to_null (path_id) VALUES (NEW.id) ON CONFLICT (path_id) DO NOTHING;
     RETURN NULL;
 END;
 $$ LANGUAGE plpgsql;

geotrek/core/templates/core/sql/pre_10_cleanup.sql

@@ -70,3 +70,8 @@ DROP FUNCTION IF EXISTS ft_merge_path(integer,integer) CASCADE;
 -- 80
 
 DROP FUNCTION IF EXISTS path_deletion() CASCADE;
+
+CREATE TABLE IF NOT EXISTS pgrouting_paths_to_set_to_null(
+    id SERIAL PRIMARY KEY,
+    path_id INTEGER UNIQUE
+);