fix rebuild tree

Author: uralbash

docs/initialize.rst

@@ -97,13 +97,16 @@ this:
 
     # Fill tree
     for item in items:
+        item.left = 0
+        item.right = 0
+        item.tree_id = 'my_tree_1'
         db.session.add(item)
     db.session.commit()
 
     ...
 
     tree_manager.register_events() # enabled MPTT events back
-    models.MyModelTree.rebuild_tree(db.session, models.MyModelTree.tree_id) # rebuild lft, rgt value automatically
+    models.MyModelTree.rebuild_tree(db.session, 'my_tree_1') # rebuild lft, rgt value automatically
 
 After an initial table with tree you can use mptt features.
 

sqlalchemy_mptt/tests/test_events.py

@@ -191,9 +191,21 @@ def test_documented_initial_insert(self):
 
         tree_manager.register_events(remove=True)  # Disable MPTT events
 
+        _tree_id = 'tree1'
+
         for node_id, parent_id in [(1, None), (2, 1), (3, 1), (4, 2)]:
-            session.add(Tree(id=node_id, parent_id=parent_id))
+            item = Tree(
+                id=node_id,
+                parent_id=parent_id,
+                left=0,
+                right=0,
+                tree_id=_tree_id
+            )
+            session.add(item)
         session.commit()
 
         tree_manager.register_events()  # enabled MPTT events back
-        Tree.rebuild_tree(session)  # rebuild lft, rgt value automatically
+        Tree.rebuild_tree(
+            session,
+            _tree_id
+        )  # rebuild lft, rgt value automatically