[SQLObject] Inheritance looses column

[Tobias W. <to...@gm...>]

Hi,
as I understand the documentation, sub-sub-classing  
InheritableSQLObject should be fine. But it messes with introspection,  
as demonstrated by the short attached script.

When there is no C and you create and retrieve B, everything works.  
Introduce C, and running it with an empty database (rm /tmp/x) still  
works:

<class '__main__.A'>
<class '__main__.B'>
X
<class '__main__.C'>
X

But run it again, so that the first list() actually does retrieve  
something, and it will raise:

<class '__main__.A'>
<class '__main__.B'>
X
<class '__main__.C'>
Traceback (most recent call last):
   File "desperate.py", line 23, in <module>
     list(B.select())
   File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/ 
lib/python2.6/site-packages/SQLObject-0.12dev_r3970-py2.6.egg/ 
sqlobject/sresults.py", line 179, in __iter__
     return iter(list(self.lazyIter()))
   File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/ 
lib/python2.6/site-packages/SQLObject-0.12dev_r3970-py2.6.egg/ 
sqlobject/inheritance/iteration.py", line 43, in next
     childResults=childResults, connection=self.dbconn)
   File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/ 
lib/python2.6/site-packages/SQLObject-0.12dev_r3970-py2.6.egg/ 
sqlobject/inheritance/__init__.py", line 309, in get
     selectResults=childResults)
   File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/ 
lib/python2.6/site-packages/SQLObject-0.12dev_r3970-py2.6.egg/ 
sqlobject/inheritance/__init__.py", line 309, in get
     selectResults=childResults)
   File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/ 
lib/python2.6/site-packages/SQLObject-0.12dev_r3970-py2.6.egg/ 
sqlobject/inheritance/__init__.py", line 290, in get
     val = super(InheritableSQLObject, cls).get(id, connection,  
selectResults)
   File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/ 
lib/python2.6/site-packages/SQLObject-0.12dev_r3970-py2.6.egg/ 
sqlobject/main.py", line 893, in get
     val._init(id, connection, selectResults)
   File "/Users/towb/Desktop/desperate.py", line 10, in _init
     print getattr(self, 'name')
   File "<string>", line 1, in <lambda>
AttributeError: 'NoneType' object has no attribute 'name'

I couldn't find out what actually happens as the code is full of  
eval()...