Pony ORM release 0.5.post1

pony/__init__.py

@@ -2,7 +2,7 @@
 from os.path import dirname
 from itertools import count
 
-__version__ = '0.5'
+__version__ = '0.5.post1'
 
 uid = str(random.randint(1, 1000000))
 

pony/orm/core.py

@@ -3598,6 +3598,7 @@ def undo_func():
                         elif isinstance(reverse, Set):
                             if attr not in obj._vals_: continue
                             val = get_val(attr)
+                            if val is None: continue
                             reverse.reverse_remove((val,), obj, undo_funcs)
                         else: throw(NotImplementedError)
                     elif isinstance(attr, Set):

setup.py

@@ -2,7 +2,7 @@
 import sys
 
 name = "pony"
-version = "0.5"
+version = "0.5.post1"
 description = "Pony Object-Relational Mapper"
 long_description = """Pony is an object-relational mapper. The most interesting feature of Pony is its ability to write queries to the database using generator expressions. Pony works with entities which are mapped to a SQL database. Using generator syntax for writing queries allows the user to formulate very eloquent queries. It increases the level of abstraction and allows a programmer to concentrate on the business logic of the application. For this purpose Pony analyzes the abstract syntax tree of a generator and translates it to its SQL equivalent.