++version (0.1.9)

CHANGES.rst

@@ -1,3 +1,8 @@
+0.1.9 (2015-09-24)
+==================
+
+- add option ``remove`` to ``sqlalchemy.events.TreesManager.register_mapper``
+
 0.1.8 (2015-09-14)
 ==================
 
@@ -29,52 +34,3 @@ Bug Fixes
 ---------
 
 - fix ``_get_tree_table`` function for inheritance models
-
-0.1.3 (2015-06-17)
-==================
-
-- Add test for swap trees
-- rename ``get_pk`` method to ``get_pk_name``
-- rename ``get_db_pk`` method to ``get_pk_column``
-- rename ``get_class_pk`` method to ``get_pk_with_class_name``
-
-Bug Fixes
----------
-
-- Fix order of elements in tree
-
-0.1.2 (2015-04-22)
-==================
-
-Bug Fixes
----------
-
-- Fix MANIFEST.in file
-
-Deprecation
------------
-
-- Delete ``BaseNestedSets.register_tree`` method
-- Delete ``BaseNestedSets.get_tree_recursively`` method
-
-0.1.1 (2015-04-21)
-==================
-
-Features
---------
-
-- Add test for rst docs and migrate on new itcase_sphinx_theme (#40)
-
-Bug Fixes
----------
-
-- Remove recursion from BaseNestedSets.get_tree method (#39)
-
-0.1.0 (2014-11-18)
-==================
-
-Bug Fixes
----------
-
-- Fix concurrency issue with multiple session (#36)
-- Flushing the session now expire the instance and it's children (#33)

CHANGES_OLD.rst

@@ -1,3 +1,52 @@
+0.1.3 (2015-06-17)
+==================
+
+- Add test for swap trees
+- rename ``get_pk`` method to ``get_pk_name``
+- rename ``get_db_pk`` method to ``get_pk_column``
+- rename ``get_class_pk`` method to ``get_pk_with_class_name``
+
+Bug Fixes
+---------
+
+- Fix order of elements in tree
+
+0.1.2 (2015-04-22)
+==================
+
+Bug Fixes
+---------
+
+- Fix MANIFEST.in file
+
+Deprecation
+-----------
+
+- Delete ``BaseNestedSets.register_tree`` method
+- Delete ``BaseNestedSets.get_tree_recursively`` method
+
+0.1.1 (2015-04-21)
+==================
+
+Features
+--------
+
+- Add test for rst docs and migrate on new itcase_sphinx_theme (#40)
+
+Bug Fixes
+---------
+
+- Remove recursion from BaseNestedSets.get_tree method (#39)
+
+0.1.0 (2014-11-18)
+==================
+
+Bug Fixes
+---------
+
+- Fix concurrency issue with multiple session (#36)
+- Flushing the session now expire the instance and it's children (#33)
+
 0.0.9 (2014-10-09)
 ==================
 

docs/example.rst

@@ -1,7 +1,10 @@
 Example
 -------
 
-Create model with MPTT mixin and register events
+Initalize
+~~~~~~~~~
+
+Create model with MPTT mixin and register events.
 
 .. code-block:: python
     :linenos:
@@ -23,6 +26,38 @@ Create model with MPTT mixin and register events
         def __repr__(self):
             return "<Node (%s)>" % self.id
 
+Events
+~~~~~~
+
+Events registered automatically, but you can do it manually:
+
+.. code-block:: python
+
+   from sqlalchemy.orm import mapper
+
+   from .events import TreesManager
+   from .mixins import BaseNestedSets
+
+   tree_manager = TreesManager(BaseNestedSets)
+   tree_manager.register_mapper(mapper)  # register events before_insert,
+                                         # before_update and before_delete
+
+Or remove events if it required:
+
+.. code-block:: python
+
+   from sqlalchemy.orm import mapper
+
+   from .events import TreesManager
+   from .mixins import BaseNestedSets
+
+   tree_manager = TreesManager(BaseNestedSets)
+   tree_manager.register_mapper(mapper,       # remove events before_insert,
+                                remove=True)  # before_update and before_delete
+
+Data structure
+~~~~~~~~~~~~~~
+
 Fill table with records, for example, as shown in the picture
 
 .. image:: img/2_sqlalchemy_mptt_traversal.svg

setup.py

@@ -10,7 +10,7 @@ def read(name):
 
 setup(
     name='sqlalchemy_mptt',
-    version='0.1.8',
+    version='0.1.9',
     url='http://github.com/ITCase/sqlalchemy_mptt/',
     author='Svintsov Dmitry',
     author_email='sacrud@uralbash.ru',

sqlalchemy_mptt/events.py

@@ -354,13 +354,16 @@ def __init__(self, base_class):
         self.classes = set()
         self.instances = _WeakDefaultDict()
 
-    def register_mapper(self, mapper):
+    def register_mapper(self, mapper, remove=False):
         for e, h in (
             ('before_insert', self.before_insert),
             ('before_update', self.before_update),
             ('before_delete', self.before_delete),
         ):
-            event.listen(self.base_class, e, h, propagate=True)
+            if remove:
+                event.remove(self.base_class, e, h)
+            else:
+                event.listen(self.base_class, e, h, propagate=True)
         return self
 
     def register_factory(self, sessionmaker):

sqlalchemy_mptt/mixins.py

@@ -84,7 +84,7 @@ def parent(self):
             foreign_keys=[self.parent_id],
             remote_side='{}.{}'.format(self.__name__, self.get_pk_name()),
             backref=backref('children', cascade="all,delete",
-                            order_by=lambda: self.left),
+                            order_by=lambda: (self.tree_id, self.left)),
         )
 
     @declared_attr